This is the first time I have had this problem so I need some help. I just got back in ham radio after being out for a long time. I have an Icom 718 and AL80 amp. No problems when running the 718 barefoot. When I crank up the amp the TV upstairs has voice and lines in it. I  cannot get on the air under these conditions.
What can I start with to eliminate the problem.
I have comcast cable if this will help.
e-mail contact is tenspeed23@comcast.net.
Any help is appreated. Antennas are 80 and 40 meter wire antenna and a vertical for 10 meters
Max