The cable length is longish but should probably be OK. My 1st guess would be the trees. A lot of times a person will get installed when there is less foilage, say winter and then the leaves come in, you get interference.
You may have some other issue but I'd eliminate the trees as problem before going to the next step. If it is your cable is theproblem then you might have to hook up a signal amplifier (which aren't expensive).
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