The bottom of the screen has an wave pattern of

your prism is off balance. it's like a shining a light into a mirror and point it into a specific spot. that mirror is out of sync, causing the image to move, which in your case it's a double image. the best way to fix this is to get a local repairman to fine tune your pic. again, the repair cost is between 200 to 400 bucks. just giving you heads up on that.

I believe your convergence IC's need replacing.

Check your antena cable, first.