Originally Posted by Theducksfan2010
Chuck, Larry & Trip,
Well, we have now gotten rain, providing my signal baseline. The unexpected happened though, all stations performed the same during the rain as I have learned to expect, both day and night.
That's as it should be, little variance over 24 hours because there are no inversions. Were there any stations that didn't come in?
Chuck, How does the 91XG work. All antennas I have used before are aluminum, with aluminum elements making metal on metal contact. The 91XG is aluminum, encased in plastic, not of the metal touches. All of the elements are held to the antenna by plastic? I have never seen anything like this before. How does it gather signal without contact?
In the majority of antenna designs the elements do not need to touch the boom even if they do. The boom is just a way to mount the elements. The energy is coupled from element to element. The boom is not a conductor.
The VHF log periodic that you have from me is different. The boom is a transmission line and must be insulated from the mast (hence the delrin boom to mast clamp). The elements are attached to the transmission line on alternating sides. The criss-cross wire on your C490 serves the same function as the boom on my antenna, alternating the elements. So there's two ways to make a log periodic, parallel transmission line with alternating elements or criss-crossed transmission line with non-alternating elements.
The combo antenna like the C490 is actually two different antenna designs on one boom. UHF is a special yagi type antenna and low VHF is a log periodic with the elements insulated from the boom. High VHF is probably a log/yagi hybrid.
Also, I put the 91XG on 20 ft of mast and bungeed it to my fence, about 5 ft from the Colorstar's current location. As great as it is supposed to be, Mundo Fox 43 was at 56% on the Colorstar and 0% with the 91XG. Needless to say I was VERY disappointed.
After getting all irked I looked up at the night sky and realized it wasn't a fair comparison, the Colorstar had a preamp, so I added a preamp to the 91XG holy S*** instant Mundo Fox. Goes to prove that no matter how great the antenna, when you live in the fringe a preamp is MANDATORY.
Not only that but at fence level the antenna must have been pointing into buildings and/or trees. I always tell people your antenna needs to be high enough to clear the local obstructions for best reception.