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 holl_ands | Home > Gray-Hoverman Antennas  
Gray-Hoverman Antennas
Original Hoverman variations, 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://macgyverisms.wonderhowto.com/how-to/build-20-super-antenna-for-better-signal-strength-more-free-broadcast-tv-channels-0146459/
Date(s): January 30, 2009. 1 - 12 of 12 Total. Shared
Hoverman Type1 (NO Reflector)
1. Hoverman Type1 (NO Reflector)  (27Aug2009)
Hoverman Type 1 (NO Reflector) per US Patent 2,918,672 analyzed using 4nec2.

If built per Patent, Type 1 would not cover up through Ch52.
Shortening Lateral Spurs from 7-inches to 6.25-inches will.

At Hi-VHF, Raw Gain is 3.5 to 5.5 dBi, but SWR is VERY EXCESSIVE....
4035 Visits
15 Images
Shared Album
Hoverman Type 1 Omni-directional
2. Hoverman Type 1 Omni-directional  (4 Sep 2009)
Hoverman Type 1 Omni-directional per US Patent 2,918,672 analyzed using 4nec2.
Actually it is Bi-Directional, NOT Omni-Directional.
1329 Visits
15 Images
Shared Album
R-S Catalog Hoverman Type 2 - 4 ReflRods
3. R-S Catalog Hoverman Type 2 - 4 ReflRods  (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.
645 Visits
16 Images
Shared Album
SBGH - NO Reflector by Autofils
4. SBGH - NO Reflector by Autofils  (7 Jun 2013)
UHF SBGH (Single Bay Grey-Hoverman) with NO Reflector analyzed using 4nec2.  Dimensions per a 4nec2 file posted by user autofils, a modification of a 4nec2 file posted by user oldsparks.
943 Visits
13 Images
Shared Album
Antennacraft G-1483 Hoverman Type 2
5. 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 , 4nec2 file by <300ohm> as modified by holl_ands: added FR & RP Cards
to facilitate repeatable runs.
877 Visits
15 Images
Shared Album
Antennacraft SuperG-1483
6. 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.
905 Visits
15 Images
Shared Album
Antennacraft Double-SuperG-1483
7. 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.]
1105 Visits
15 Images
Shared Album
Lo+Hi-VHF SBGH w NARODS
8. 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.
844 Visits
30 Images
Shared Album
SBGH Hi-VHF & UHF Combo - X0255/6
9. 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.
2781 Visits
12 Images
Shared Album
DBGH Hi-VHF & UHF Combo
10. 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.
3367 Visits
28 Images
Shared Album
SBGH Wide Beamwidth/Omni Investigations
11. 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.
1223 Visits
54 Images
Shared Album
DBGH Wide Beamwidth/Omni Investigations
12. 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.
327 Visits
39 Images
Shared Album