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 holl_ands | Home > Gray-Hoverman Antennas  
Gray-Hoverman Antennas
Original Hoverman variations, incl Antennacraft G-1483 and Radio-Shack 15-1627,
SBGH (Single Bay Gray-Hoverman) and DBGH (Double Bay Gray-Hoverman)
analyzed for Hi-VHF and UHF performance using 4nec2.

I have avoided replicating G-H results found elsewhere. Much more info can be found here:
http://www.digitalhome.ca/ota/superantenna  [Grey-Hoverman]
http://www.jedsoft.org/fun/antennas/dtv/gh.html  [Grey-Hoverman]
http://clients.teksavvy.com/~nickm/index.html    [nikiml's Optimized Grey-Hoverman & Stealthawk]
http://www.digitalhome.ca/forum/showthread.php?t=81982  [Grey-Hoverman]
http://www.digitalhome.ca/forum/showthread.php?t=121956  [Hi-VHF & UHF Grey-Hoverman]

Some DIY websites:
http://www.digitalhome.ca/forum/showthread.php?t=95898 [300-ohm's DIY G-H thread]
http://mysite.verizon.net/res11d41p/id2.html  [UHF SBGH-6 + Hi-VHF NARODS]
https://sites.google.com/site/maycreates/ota-setup/my-sbgh [Mayhem Creation's DIY G-H]
http://www.diytvantennas.com [Chris Dahl's DIY G-H]
http://www.instructables.com/id/Gray-Hoverman-TV-Antenna-Final-Assembly/?ALLSTEPS [unclesam's DIY G-H]
http://community.9wsyr.com/blogs/plugged_in_the_dtv_switch/archive/2008/05/27/3046816.aspx [DBGH by JHEngineering for WSYR]
http://www.casano.com/projects/hoverman/index.html [Wm F Dudley Jr's DIY Stacked DBGH]
http://www.youtube.com/watch?v=YaYDtOqpTOI [Even kidz can do it.....]
http://techorator.blogspot.com/2013/04/homemade-20-super-antenna-out-of-paper.html  [nikiml's Hi-VHF/UHF GH0 using Foil Tape on Cardboard]
Date(s): January 30, 2009. 1 - 14 of 14 Total. Shared
GH - nikiml EVAL Summaries
1. GH - nikiml EVAL Summaries  (16 Dec 2016)
Grey-Hoverman - EVAL Summaries for various Optimized Antennas posted on nikiml's website:
http://clients.teksavvy.com/~nickm/index.html

CLICK to open Thumbnail and SELECT HTML Version [ignore *.pdf version].
Will display 4nec2 Text File, Outline Figure, Azimuthal Patterns, Gain/SWR Curves and Results in Tabular Form.
311 Visits
3 Images
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Hoverman Type1 (NO Reflector)
2. Hoverman Type1 (NO Reflector)  (27Aug2009)
Hoverman Type 1 (NO Reflector) per US Patent 2,918,672, issued 22Dec1959, analyzed using 4nec2, assuming AWG12:
http://www.freepatentsonline.com/2918672.pdf
All 45-deg Zig-Zag and Horizontal Element Lengths L=7.0-in.

At Hi-VHF, Raw Gain is 3.5 to 5.5 dBi, but SWR is VERY EXCESSIVE....
9433 Visits
15 Images
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Hoverman Type 1 Omni-directional
3. Hoverman Type 1 Omni-directional  (4 Sep 2009)
Hoverman Type 1 Omni-directional per US Patent 2,918,672, issued 22Dec1959, analyzed using 4nec2.
Actually it is Bi-Directional or Quasi-Omni, but NOT True Omni-Directional.
6700 Visits
15 Images
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Hoverman Type-2 with 4 Split RR Pair's
4. Hoverman Type-2 with 4 Split RR Pair's  (29 May 2017)
Hoverman Type 2 with 4 Reflector Rod Pairs [each with a Mid-Point Gap] analyzed using 4nec2.

Hoverman Type 1 (NO Reflector) per US Patent 2,918,672, issued 22Dec1959, analyzed using 4nec2, assuming AWG12:
http://www.freepatentsonline.com/2918672.pdf

All 45-deg Zig-Zag and Horizontal Element Lengths L=7.0-in.

If built per Patent, Type-2 would not cover up through Ch52.
Shortening Horizontal ELements from 7-inches to 5.0 to 6.25-inches will.
0 Visits
18 Images
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Hoverman Type 2 w 4 RRs - Radio Shack
5. Hoverman Type 2 w 4 RRs - Radio Shack  (4 Apr 2013)
Radio-Shack "4-Bay" "Spike" variation of Hoverman Type 2 with 4 Reflector Rods analyzed using 4nec2,
as depicted in R-S 1971 Catalog: http://www.radioshackcatalogs.com/html/1971-c/h292.html
Dimensions per alwjoplinmo and EscapeVelocity, 4nec2 by alwjoplinmo, with AWG10 Elements and 3/8" O.D. RR's.

Original Hoverman Patent US3148371, dated 8Sep1964, for the Type 2 (adds 4 SPLIT Reflector Rod Pairs)
does NOT have the short "Spikes" at the ends of the outer whiskers and at the center Feedpoints:
http://www.freepatentsonline.com/3148371.pdf

All 45-deg Zig-Zag Lengths L=7.0-in, except Top & Bottom are 6.4-in plus 1.0-in Vertical Spur at Ends.
Vertical Spurs at Top & Bottom are unique to R-S versions, Length=5.1-in.

PS: For my version (see "HOVERMOON" photo below), I measure L=7.0-in with 6.5-in plus
1.25-in Vertical Spurs at Ends...and 5.25-in Vertical Spurs....a nearly negligible difference.
Note that the Spurs on the Ends actually turns back AROUND.

EDIT (5Mar2017): Added Hi-VHF Performance Charts.
4268 Visits
21 Images
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SBGH - NO Reflector by Autofils
6. SBGH - NO Reflector by Autofils  (7 Jun 2013)
UHF SBGH (Single Bay Grey-Hoverman) with NO Reflector analyzed using 4nec2.  AWG9 Elements.
Dimensions per a 4nec2 file posted by user autofils, a modification of a 4nec2 file posted by user oldsparks.
All 45-deg Zig-Zag Lengths=7.07-in and Top/Bottom Horizontal Stub Lengths=5.0-in.

UHF Raw Gain = 6 to 11.5 dBi and SWR (300-ohms) Under 3.2.
Hi-VHF Raw Gain = 2.9 to 4.3 dBi and SWR (300-ohms) = 24 to 28 is Excessive.

EDIT (5Mar2017): Added Hi-VHF Performance Charts.
6157 Visits
18 Images
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Antennacraft G-1483 Hoverman Type 2
7. Antennacraft G-1483 Hoverman Type 2  (4 Apr 2013)
Antennacraft G-1483 variation of (SBGH) Hoverman Type 2 (With 4 Reflector Rods) analyzed using 4nec2.

Dimensions per EscapeVelocity, 4nec2 file by <300ohm> as modified by holl_ands: added FR & RP Cards
to facilitate repeatable runs.
13601 Visits
15 Images
Gallery Album
Antennacraft SuperG-1483
8. Antennacraft SuperG-1483  (1 Apr 2013)
Antennacraft SuperG-1483 Gray-Hoverman Antenna analyzed using 4nec2.

High Gain in NEW UHF Band, but Front/Back, Front/Rear and Forward Sidelobes are much worse
than most other Hi-Gain Antennas.
5936 Visits
15 Images
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Antennacraft Double-SuperG-1483
9. Antennacraft Double-SuperG-1483  (1 Apr 2013)
Antennacraft Double-SuperG-1483 Gray-Hoverman Antenna analyzed using 4nec2.

Very High Gain in NEW UHF Band, but Front/Back, Front/Rear and Forward Sidelobes are much worse
than most other Hi-Gain Antennas.

NOTE: Charts do NOT include RF Combiner Loss, which is "typically" 0.5 to 1.5+ dB, see:
www.antennahacks.com  [Back-To-Back Combiner Loss - divide by two.]
7239 Visits
15 Images
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Lo+Hi-VHF SBGH w NARODS
10. Lo+Hi-VHF SBGH w NARODS  (24 Nov 2012)
Lo+Hi-VHF SBGH (Single Bay Grey-Hoverman) w NARODS analyzed using 4nec2.

Two versions were analyzed: GHn2 is constrained to about 89-in x 89-in with 4 NARODS in the middle.
GNn4 is a larger 98-in x 98-in with 8 NARODS in the middle, providing better Gain on Ch7-13.

GHn2 from nikiml's optimized 4nec2 file: http://clients.teksavvy.com/~nickm/gh_n_vV/gh2n_4v2_6V9.html
GHn2 provides about 4-5 dBi Gain in Ch2-9 and about 9 dBi gain on Ch10-13 with SWR under 2.9.

GHn4 from nikiml's optimized 4nec2 file: http://clients.teksavvy.com/~nickm/gh_n_vV/gh4n_4v75_10V7.html
GHn4 provides about 5-6 dBi Gain on Ch2-6 and 10-11 dBi Gain on Ch7-13 with SWR under 2.6.
5088 Visits
30 Images
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SBGH Hi-VHF & UHF Combo - X0255/6
11. SBGH Hi-VHF & UHF Combo - X0255/6  (6 Sep 2009)
SBGH (Single Bay Gray-Hoverman) with 38 Resonator Rods (12 Hi-VHF, 24 UHF and 2 NARODs) analyzed using 4nec2.
WildWillie's X0255/X0256 design as modified by 300ohm for Symmetry and AutoGainTest.

Provides VERY GOOD performance on BOTH New UHF Band (Ch14-51) and Hi-VHF Band (Ch7-13).
BUT it's very BIG: 87-in H x 72-in W x 10.5-in D.
7829 Visits
12 Images
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DBGH Hi-VHF & UHF Combo
12. DBGH Hi-VHF & UHF Combo  (31 Jan 2009 (UPDATE))
DBGH (Double Bay Gray Hoverman) with 28 Reflector RODs (3/8-in O.D.).  Combo Hi-VHF & UHF Antenna Simulation Runs using 4nec2.
Antenna Design and original EZNEC file posted by <300ohm> on 16Jan2009 to http://www.digitalhome.ca/forum/showthread.php?t=99907

Slides 7-15 are UHF Band Performance.  They illustrate the need to use BARE WIRE (vice Insulated) for UHF Band.
Above Ch47 had both Raw Gain Loss and additional Net Gain Loss due to SWR degradation.

Slides 16-24 are Hi-VHF Performance.  Insulation had only minor impact...and actually IMPROVED CH7.
However, these detriments could appear in different forms in other designs...

Note poor F/B and F/R on all Hi-VHF except Ch9 & 10.  Element placement can be changed to reoptimize for either Ch7-8 or Ch11-13.

UPDATE 31Jan2009: Due to (inches vs meters) error in defining insulation thickness in 4nec2 file, updated all runs.
9694 Visits
28 Images
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SBGH Wide Beamwidth/Omni Investigations
13. SBGH Wide Beamwidth/Omni Investigations   (10 Sept 2009)
SBGH Wide Beamwidth Investigations (e.g. 60+degrees or multi-lobed), including higher Gain
Omnidirectional antennas analyzed using 4nec2.
In response to Vorg's situation in Tucson, AZ with THREE widely separated tower groups.

Includes following SBGH versions:

a. WW-X0412 by wildwillie: TWO Sets of Slanted Reflector Rods, 28 each Set.
b. WW-X0414 by wildwllie: One Set of 7 Slanted Reflector Rods: 3 irregularly shaped Lobes.

c. WW-X0418 by wildwillie: Elements Swept Forward + 28 Angled Reflector Rods: Nearly 180-deg coverage.
d. WW-X0418-Mod8: holl_ands Mod: 8 vice 28 Rods: More Rear Gain.
e. WW-X0418-Mod4: holl_ands Mod: 4 vice 28 Rods: Irregular, coming closer to Omni-directional coverage.
f. WW-X0418-Mod0: holl_ands Mod: NO Reflector Rods: Nearly Omni-directional coverage with 5-6+ dBi Raw Gain.

This is much more than a typical 2.15 dBi (0 dBd) Gain Omni-directional antenna.....or Rabbit-Ears.
5573 Visits
54 Images
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DBGH Wide Beamwidth/Omni Investigations
14. DBGH Wide Beamwidth/Omni Investigations  (12 Sep 2009)
DBGH Wide Beamwidth Investigations (e.g. 60+degrees or multi-lobed), including higher Gain Omnidirectional antennas analyzed using 4nec2.
In response to Vorg's situation in Tucson, AZ with THREE widely separated tower groups.

Includes the following DBGH versions:
a. 300ohm-X0429, mod by 300ohm to wildwillies X0418-Mod0 (No Reflectors): Six Lobes, beamwidth varies with frequency.
b. XA-X0433, mod by XAuto to wildwillies X0418-Mod0 (No Reflectors): 2 Very Fat and 2 Narrow Beamwidth Lobes.
c. WW-X0442, wildwillies: 2 Fat and 1 Narrow Beamwidth Lobes.
d. WW-X0450 (aka WW-X0442 Rev3) by wildwillie: Quasi-Omni-Directional.
4322 Visits
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