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Quick, easy installation of antenna on 1" or 7/8" railing. Ideal for G.P.S., VHF radio, and whip antennas, has direct feed-thru hole for coax cable. Ratchet surface permits 360 rotation for adjustment/lay-down. Holds antennas up to 8' (2.4 meters) in length. No drilling required; all necessary hardware provided. (US Patent #4546949) Model 311-N Strong, fiberglass-filled nylon rail mount for permanent antenna installation with hex-key vertical adjustment. Smooth spherical shape won't catch lines or clothing. Model 311-NLH Similar to 311-N (listed above), but has lay-down handle that permits quick, easy lay-down of antenna. Additional Details SKU : NEW311N
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