Yes, trees can be a problem.
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Without any antenna I can pick up ABC, CBS, and NBC.
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It doesn't matter how much attenuation you use because the signal is getting into the TV after the attenuator. If you haven't grounded the coax, do that now with a grounding block.
http://www.digitalhome.ca/forum/show...&postcount=124
http://www.digitalhome.ca/forum/show...&postcount=126
http://www.digitalhome.ca/forum/show...&postcount=128
http://www.digitalhome.ca/forum/show...&postcount=137
http://www.digitalhome.ca/forum/show...&postcount=138
Then try more attenuation.
Next try two UVSJs in series to remove anything below UHF; use common and UHF ports.
Or, if you want 12, try two HLSJs in series instead of an FM filter; use common and high ports.
http://www.hollandelectronics.com/ca...-Diplexers.pdf
Last resorts:
1. Custom filters to attenuate your strongest signals.
http://www.tinlee.com/MATV-Bandstops.php?active=3
2. Screened enclosure for the TV
http://www.digitalhome.ca/forum/show...&postcount=136
And avoid the trees.
http://www.hdtvprimer.com/antennas/siting.html
scroll down to
Trees and UHF
sometimes the link doesn't work
I see a lot of trees in your area, Attachment No. 2.