Buy from Amazon : br br Magnetic Indoor Base or Mobile All Band Scanner Antenna with Cable and Bnc Connector br br INDOOR BASE OR MOBILE SCANNER ANTENNA WITH BNC CONNECTOR br INCLUDES HEAVY DUTY 5 CHROME MAGNETIC BASE WITH 16 FEET OF RG58u CABLE br Omni-directional design 23 inches tall 21 inches wide at top br Black fiberglass heli-wound antenna construction antenna threads 38 x 24