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Connection is especially good when I'm touching the antenna but as soon as I'm down from the roof, the reception started to degrade again.
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When your body is near or touching the antenna, it can affect the reception in a negative or positive way. We see this often with indoor antennas too.
The location of the antenna is critical; you need to put it where the signal is strongest, which might not be where you want to mount it.
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It was working great for a year or two but lately, the signal it receives was like in and out. I'm guessing the tree across the freeway grew taller and started to block the signal.
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Your guess is probably true. Trees do serious harm to TV signals.
http://www.hdtvprimer.com/antennas/siting.html
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Any suggestion on the antenna I can replace it with.
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There is no magic antenna that can "see" through trees.
Can you show us a photo of your antenna and a photo of what the tree looks like when your antenna is aimed in that direction?
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So will replacing antenna to a better one solve the problem or it's not going to make any different because of the trees? Please advise?
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Maybe, but first we need to see your present antenna and it might be necessary to move it, or go higher.
What we would like to know is your exact location by address or coordinates so that we can draw the green signal lines on the satellite image. We don't expect you to give that information in the open forum, but you might be willing to give it in a PM (Private Message).
For example, a house in your area:
Besides the tree you also have a hill in the signal path.
The transmitter is on the left and your location is on the right.
http://www.tvfool.com/?option=com_wr...ALLTV%26n%3d10