Iam struggling to receive OTA signals from Denver. My TVFOOL reception report is here:
http://www.tvfool.com/?option=com_wr...e2cbfa5f7ed489
I am especially interested in receiving Denver channels 7 & 9 which unfortunately are in the high VHF. I currently have an 8-bay bowtie antenna (Xtremesignal HDB8X) on a non-penetrating roof mount. The VHF gain of this beast is not available from Xtremesignal, although I've asked, so I assume it's NADA. I am using the signal level /signal quality of an LG FPTV to estimate quality. I also have a SiliconDust HDHomerun networked tuner attached, and the goal is to record OTA broadcasts using the available DVR software. So far I have learned that I need a pretty good signal to get a usable recording. A quality factor of 55+ is usually required.
What has me baffled is that before I mounted the antenna, I had it resting upright in the TVroom at the top of the house, indoors pointed at about 100 degrees (resting on the wall, pointed slightly down) and I was getting a pretty good signal. I thought no problem, up on the roof and pointed at the proper angle will make this a piece of cake! Well that was wishful thinking. Up on the roof, pretty unobstructed yields no usable signal, despite the calculated TVFool values for VHF Ch 9. I am wondering how I ever saw a decent signal indoors at all. It seems surreal.
Anyway I am forced to face the reality that the gain in the VHF for the HDB8X must be 0 (or less) and have purchased an RCA ANT751R antenna to see if I can rescue a usable signal. I have attached a spreadsheet with measured values at different angles, as well as a photo of the install. I have a Winegard LNA-200 at the antenna feeding 50 ft coax with a splitter at the TV feeding it and the SiliconDust network receiver. The amplifier makes only a tiny improvement in signal level, if any.
Any advice would be welcome.