Originally Posted by Falcon_77
I hope you don't have much Lo-E glass over there. It is widely used in SoCal on any newer installations and isn't kind to OTA and cell reception for that matter. That plus stucco siding.
My first exposure to the Low-E glass problem was in Sept 2008, so I was wondering about it now:
I made some tests with an original CM4221 in the window. The retirement home that I'm in is fairly old, so I doubt that the glass is Low-E. My measurements seem to indicate that, but I wasn't able to confirm it because I couldn't get the window fully open; there is a safety stop that keeps the window from opening any more than 5". I could build a little UHF Yagi and stick it out that opening.
I first compared the GE29884 with the Original CM4221:
GE29884 vs Original CM4221 at Left Window
RF GE29884 CM4221
dBmV dBm dBmV dBm
16 +7.8 -41.0 +10.9 -37.9
33 +4.7 -44.1 +9.4 -39.4
40 -7.5 -56.3 +3.6 -45.2
Next, I wanted to see how much the venetian blind attenuated the signals:
Channel 16, CM4221
Blind down, slats closed: about -10 dBmV
Blind down, slats open: about -10 dBmV
Blind up: about +10 dBmV
So, the venetian blind attenuates the signal about 20 dB.
The window sill is about 9" deep. The space between the glass and the blind is about 7-1/2", which is enough room for a panel antenna.
The glass is double layer with an air space between. There are plastic muntins between the two layers of glass to divide the window into 6 lites. The screen appears to be plastic.
Speaking of a big Stellar antenna, attached is a pic of my Stellar which I have now mounted on the deck. It seems to be working well, but it's hard to tell yet as I have been getting some powerful tropo out of San Diego lately. Oh no, there's the rotation problem again.
Nice photo of your antennas on the deck. I edited your photo and told it to behave.