Amazon.com: SIIG Pro Wireless IR Remote Control Extender Kit, Infrared Repeater Signal Booster, IR 20 to 60 KHz - USB Powered Transmitter and Receiver with Pairing Button - 656FT (200m) CE-RC0111-S1 : Electronics
Harmony® RF Wireless Extender Extends the range of select Harmony remotes at Crutchfield
Best Buy: Logitech RF Wireless Extender 966195-0403
Amazon.com: Logitech Harmony IR Extender System - Black (Discontinued by Manufacturer) : Electronics