www.hdcom.com makes it easier. yes rp-sma is the right connector. it is the same on linksys wmp11 pci card we use with 50 feet of LM R 400 cable and 14 dbi directional antenna from HD. of course we are only going 2000 to 2500 feet from our linksys wap11 w/ 13 dbi omni on it.