I thought I'd describe my experience with trying to improve our TV reception. I went through several failures before coming upon a solution.
We are 20 miles from the tv towers which all originate from the same location. The signals are not Line of Site. They are 1edge signals.
My TV SIGNAL ANALYSIS REPORT:
http://www.tvfool.com/?option=com_wr...e1c69f877f19af
Originally, we had a Terk Direction antenna with a built in pre-amp (
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1). This antenna received some but not all channels reliably.
Next, the D8 Multi-Directional antenna with a pre-amp (RCA Audiovox TVPRAMP1R) was tried It received channels reliably that the Terk did not. Unfortunately, it failed for the other channels.
So I decided to try and combine the antenna signals by trying to combine them using Eagle Aspen Signal Combiner(
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1) on the pre-amp outs to the tv. 2 identical length cable feeds went up to the roof antennas. Unfortunately,
some the channels signals degraded so this was not the answer. I hear it was a bad to tried to gang 2 different types of antennas but since I had both, I decided to try it but they were right. It was not helping.
The final working solution was simply to use one antenna with the RCA pre-amp. The AntennaCraft HBU33 brought in all the channels reliably! I found this antenna by reading this Forum so thank you!! If you have 1edge type tv signals and all UHF and/or high VHF channels to receive, this could be what you are looking for.