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What are your opinions on attic installs? Do they cut down a lot of reception?
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This might be helpful:
http://www.antennasdirect.com/attic_installation.html
I've seen figures from 3 dB (50%) to 20 dB (99%) tossed about as the attic losses, but I haven't done any measurements myself. A "typical" asphalt shingle over plywood decking is somewhat benign by itself.
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Originally Posted by gnussbaum
I have another question - I have DirecTV. IS there a way to receive OTA signal from that and just use a diplexer?
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TV/Sat diplexers are used to combine and separate OTA antenna and satellite signals so that a single cable may carry both.
However, the newer Directv systems, specifically the 5-LNB and newer, utilize satellite signalling protocols that preclude their usage with diplexers and will make it necessary to run a separate coax for the OTA signal.
If your question is whether the Directv dish is going to receive your local OTA broadcasts directly, that answer is "no".