Originally Posted by kevm14
I got the WG 7697P up and running.
I am a little disappointed, though I am not sure the antenna is doing anything wrong. I think I am in a worse area than I thought, at least as it pertains to the fringe channels I thought I would get.
The Boston CW and ION that I wanted to receive, nay, expected to receive and why I purchased a high gain antenna like this, were too weak, even pointed directly at the Boston towers.
We tried clocking the antenna at as many discrete positions as we had time for, with the rapidly fading light last night. We let Media Center run through the signal strength loop each time we moved the antenna. The best overall reception seemed to be pointing at the only real open spot out of my neighborhood, or about 300°. As a refresher I was expecting to receive the strong RI stations @ 41° and the weaker Boston stations at 28-29° while pointed at ~32°. Well, how about 300? And surprisingly I get RI CW from 83° and ION from 258°. I think I have a multipath problem, no? I did get Boston CW best as LOS I think, but "best" was only 3 out of 6 bars which I know would never be reliable enough to bother with. And Boston ION never came up over 1 or 2 bars.
It's the trees. The signals can't go thru the trees, so they are diffracted around them giving you antenna aim that is not towards the transmitters. If you could somehow gradually increase the height of your antenna, you would begin to see your azimuth readings match the ones in the tvfool report. (Where's that friend with a "cherry picker" truck when you need him?)
In short, I think I have quite a few channels that aren't LOS, contradicting TV Fool
. The reception results that I got did not correlate with antenna alignment, at least as far as my understanding that all of my channels were available LOS at 15 feet.
Tvfool is sometimes wrong, but not in this case. It has to make some assumptions, one of which is that there are no trees directly in front of the antenna.
Overall I get more channels than before, but instead of the 24 I thought I'd get, I am down around 19 or so.
I think you are doing very well considering the location of the antenna.
Do I need to add height? An amp? Experiment more with aim? Should I have gotten the 14 foot 7698P, after all that deliberation???
Yes, you need to add height....as much as possible and away from the trees as much as possible.
A preamp will make up for the loss in the coax downlead (as 300ohm said) but it will not make up for a poor antenna location.
The aim experiments that you have already done have told you that the trees are in the way.
The 7698 is not the best solution for your problem. Its gain is only slightly more than the 7697 and it is a lot harder to handle up in the air. Actually, I initially imagined that you would end up with the 7696. An antenna smaller than the 7698 mounted up-in-the-air in an open location will out perform the 7698 in your present antenna location.
Many times I have measured a signal increase of more than 10 dB after moving an antenna to a better location.
I think getting the antenna in the path of the signal is worth a lot more than a little higher gain antenna placed sub-optimally.
The hdtvprimer site seems to be working now. Take a look at the neat diffraction diagrams:http://www.hdtvprimer.com/ANTENNAS/siting.html