I've tried two or three different video senders, and haven't managed to get a decent link with any of them - I got severe picture interference with all of them, no matter what channel I tried. I suspect this might be related to wifi links, which if I remember correctly appear to operate somewhere around the same frequencies - but whatever the cause, I haven't had any luck.
If you do try a sender, make sure you can take it back if it doesn't work for you.