teleview

A preamplifier or amplifier will most likely make the reception worse because the the Signal strengths are Strong at your location and a amplifier will most likely also amplify the problem.

Try putting the antenna above the roof and run a separate long coax to the Tv.

What is reception like now.

If cable channels are being received on the Tv , then somewhere somehow the cable Tv channels are being transmitted outside of the cable Tv system.

This seems like a good situation , (free cable tv) , however it is not.

Cable Tv uses many of the same frequencies as , police , fire department , air craft , and etc. and these cable Tv services are to be in the - closed system - of the coax.

I recommend call the cable company and they will use location finding receivers to find the cable leaks and repair them. Cable companies do get fined by the Federal Communications Commission for not having a closed system.