LIke K6AER said, you can get a filter to null out the AM broadcast band. Some years ago, my friend had the same issue. He had a Kenwood TS 850SAT and the local AM station some 5 miles away was really creating havoc on 160 and 80 meters. He even could hear them on 40 and 20 meters. At that time ICE made a filter just for that and it cured his problem. I have no idea who makes those types of filters now, but if you still have that problem, give DX Engineering a call. They may be able to help you out.
I had an FT 817 but back then replaced it with the IC703+. I now use a KX3 and a KX2 but I just can't part with my IC 703+, it's that good of a radio.
Barry, KU3X