Ron, Geoff, Larry and other interested parties,
I sent an email last evening to Derek Justman, Antenna Product Engineer for the Winegard Company. My note follows:
A friend of mine, Ron, recently completed installing a Sensar III
GS2200 on a 15-foot pole next to his home. A second friend, Geoff,
just installed a Sensar II GS2000A on a 30- foot pole next to his
home. I recently purchased, but have not yet installed, a Sensar II
GS2000A, which I am planning to install on a four-foot mast on the
peak of my roof. I estimate that the antenna will be about 19 feet in the air.
We live within a few miles of each other in Sarasota, FL. Our goal is
to receive the Tampa DTV stations. The most difficult station to
receive is 10.1 (digital 24), the CBS affiliate WTSP-DT.
Geoff has reported no problems. He is not using a rotor. Ron is using
a rotor but cannot pull in 10.1. Do you believe the reason for Ron's
difficulty is the height of his mast or the reduced gain of the GS2200
compared to the GS2000A? The average gain for the GS2200 is 12 dB VHF
and UHF while the GS2000A is 15.5 dB VHF and 19.5 dB UHF. How
significant is this difference?
Would Ron be better off with a Sensar II? Could he install an
unamplified GS1100 and fit it with an AP-8275 for 28 dB of UHF and VHF
gain? Might this solve his problem?
Derek's reply came this morning:
"First off all, understand that digital 24 is transmitting at a near polar opposite of the other DTV stations in your area. What may be happening is that the GS2000A that you have may have stronger backlobe reception for 24 than the GS2200. I really do not believe the amp difference is significant. Also, for difficult UHF DTV stations, sometimes the right height of the antenna will make a difference -- when a station is weak, the reception is better on such channels at different heights. In addition, the signal strength varies from one neighborgood to another. Ron may just simply be in a neighborhood where 10.1 coverage is spotty.
To see if this is the case, you can visit a new Web site http://www.checkhd.com/
click "antennas", and submit the address of your friends. Check the reception rating (poor, good, excellent) of 10.1 by clicking on the "light green" color map, since that would be the map of an amplified multidirectional antenna."
I just sent another note off to Derek asking him to comment on the idea of using a GS1100 with an AP8275. I'll keep you posted.
Meanwhile, my installation is on hold until the Samsung SIR-T451 tuner I ordered shows up. It's currently on backorder at Crutchfield.