Wireless Transmitter/Receiver for Rear speaker in HT

Can anyone recommend a decent Wireless solution for rear speakers in my home theater. I have a large room (30x26) and no easy way to run speaker cables or interconnects. The distance between transmitter and receivers will be ~30 ft, and the wireless units I've found get a lot of complaints for dropouts.

I am open to finding used units or new.

thanks in advance!