Do I understand correctly that you mean that the even are in the 90's and odd dropped down (or visa-versa)? If this is the case than I,m going to go out on a limb and suggest you check out as much of the line as possible, especially the connections. Too often I have found line spliced together when it should be a solid run. When these splices are outside, they often lack waterproof fittings and the center conductor is rusted clean through (amazed that they had any signal at all). I have also seen many cases of line being run outside on ground or low porch or deck in the same area as pets that chew everything they see and the result is a chewed up line in several locations. The same applies to the attack but with squarrels.

If nothing else, I still question that sony receiver. Is that the one that still has poor signal? Swapping the receiver locations should clue you in.