This remote control allows the selection of the two antennas, manual tuning of L and C and of course the automatic tuning. Two LEDs show the status 'tuned' and 'hi SWR'. The MFJ-993RC comes with a 180cm long cable. This is a standard serial cable with 9 pin SubD male/female connectors. This cable can be extended to larger lengths. A maximum length is not specified by the manufacturer, but about 15 to 20m should be possible