................... X10's use of 2.4G frequency is a nice idea, but there are too many common household items to interfere with it.
There is a lot of bandwidth at 2.4. I run broadband, phones, cameras (X10 wireless) and the senders and receivers. The only time I get any noticeable interference is when I run the microwave. Try switching channels [of course] then... if that doesn't work check your broadband routers setting.
Another trick is aiming the patch antenna. Instead of trying to configure the antennas point-to-point.... try aiming the sender into a corner and the aim the receiver patch antenna to the same corner. Hope this helps.