5/8 Slim Duck 3 to 7 db gain flexible base loaded antenna, manufactured tough enough for the military and aesthetically pleasing for the consumer. Available in VHF and UHF frequencies, utilizing the Tuned Antenna's one piece MPQ-2000 Space Age covering system. Available in MURS, GMRS, VHF, UHF and Business Band. The 5/8 wave rubber duck antenna has a coil that gives maximum gain for a rubber duck. The signal goes up and flattens out to find repeaters or simplex the amount of power in your radio is the most important part of your transmitting. All Smiley Antenna’s have less than 1:3 SWR ( standing wave ratio) Which give you all the gain your radio puts out. For a custom frequency call 1-800-527-5439 or email sales@smileyantenna.com 12"