Falcon FGP-2m, 2 Meter 1/4 Wave Ground Plane Base Amateur Ham Radio Antenna 144-148 Mhz Stainless steel whips, 1/4 Wave length 144-148 mhz. SO-239 Connector for screw on PL259 connector 1.5:1 SWR or Better Thick aluminum mounting bracket, Heavy duty center cone mount fits 1 inch 1 1/4 inch and 1 1/2 inch round mounting pole