I have a very nice Channelmaster OTA antenna on my roof and I get about 20+ channels but can not get my local CBS channel even though its not really a weak signal. I have tried everything and it only comes in if the weather is just right. I do have trees in front of it but I get weak obscure channels but not the network CBS (Rochester, NY) I have an amplifier but not until it gets into the house where there is a electrical plug so the signal has to run about 20-25 feet before it hits the amplifier. I have been reading that the preamp should be near the antenna but I have no electrical plug near it so that is why I put it in the house. Does anyone know of a work around and if it works best near the antenna instead of in the house? I really love the OTA idea, better pic, great channels and no cost. Would like to cut the cord but cant till I resolve this. Thanks in advance.