Wireless Sony MDR-RF820RK not working well on Sharp LCD-TV

Hello,

I just got these headphones. Looks nice, but, er, it doesn't work... I explain.

I have a Sharp LCD-TV (32p50) with the normal jack (3,5mm). When I connect them both I got only a miserable voice full of noises. I put on the Noise Filter, changed the three channels available if the sound was better, but no. In fact what I got very well, it is some radio channels 8/

I read the manual from Sharp TV, Sony headphones and even the Digital TV box I have because I know it can receive radio channels as well, but nothing helped to found the source of the problems...

I am living in a building, so it is possible that some radio antenna make trouble for reception? Any ideas? Anyone with this problem?

Thx