Hi-VHF and UHF Tapered Loop with Screen Grid Reflector PLUS Hi-VHF Stick Dipole analyzed using 4nec2, assuming Loop dimensions per d510d180 post.
Note that 8-in Outer Loop is smaller than 9-in O.D. in Antennas Direct C2-V: http://www.avsforum.com/forum/25-hdtv-technical/798265-how-build-uhf-antenna-60.html#post15866958 [Code section is missing a Slash??? Had to copy/paste the webpage to MS-Word to extract.] [Then I had to TRY to fix AGT, but stability issues prevented that...so I rebuilt the entire Tapered-Loop model, see 4nec2 Files below.]
DIMENSIONS: Size Assembled (per A-D C2 data sheet) = 20" H x 10" W x 5" D (incl. mount?). Per user d510d180 (presumably based on wavelengths at 470 & 700 MHz) Loop Diameters = 8-in and 5-in. And Trial Runs revealed best performance with 4-in Separation between Tapered-Loop and Reflector. Other Dimensions extrapolated from photos, incl. Feedpoint found towards the bottom of fol.: http://www.hdtvprimer.com/ANTENNAS/TemporaryPage.html
Three variations were analyzed: C2-V with Hi-VHF Dipole, UHF-ONLY C2 with Reflector and C2 without Reflector.
a) Tapered Loop with Screen Grid Reflector PLUS Hi-VHF Dipole:
b) Tapered Loop with Screen Grid Reflector:
c) Tapered Loop without Reflector:
Date(s): 18Jan2015. Album by holl_ands. 1 - 51 of 51 Total. 6306 Visits.