Here are some results of the antenna tests I've been working on. The tests were carried out just like the ones posted earlier but this time using different antennas. Here is a short description of the antennas tested. The 9 3/4" x 9 1/2" uses a 36"h x 40"w curved reflector made of 2"x4" wire fence , the 10" PVC uses #18 galvanized wire strung back and forth between the PVC frame, and the winegard style uses a 40"h x 48"w curved reflector made of 2" x 4" wire fence.
The 12" x 11 3/4" 4 bay uses a 46"h x 44" wide curved reflector made from 1" x 2" wire fence and the Hoverman uses a split screen reflector made from 1/2" x 1/2" hardware cloth.
I tested some of the antennas with different reflector spacings to show what effect that has on different channels. The tests were done on UHF and VHF-HI.
The Hoverman was omitted from the VHF-HI plot because it had negative 11 - 16 db gain.
This last plot is of a DIY 8 bay using 10" whiskers and the effects of different feeders. The first test was feeding the antenna with 2 baluns and 2 equil lengths of rg6 to a combiner. The second test was using 34" of 450 ohm ladder line and attaching a balun in the middle. The 3rd test was attaching a CM spartan3 amp fed with a short length of 300 ohm from the 450 ohm ladder line to the amp, I then subtracted the advertised gain of 22db from the readings. The gain for the amp test may not be 100% accurate but is good for comparing the gain curve with the other tests. I also added 2 other antennas for comparison.
