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Marine Coax

VHF signal boost?

I am attempting to boost the transmission signal of a marine VHF unit that has been set up to operate as a base unit. The antenna is mounted on the roof of 60 ft tall building, but transmission range is only about 10 miles.The radio has a max power of 25W, the antenna is 9dB, 1/2 wave, I am using more than 150 ft. of Rg u8 coax cable. Any suggestions?

Better/higher antenna, and/or a VHF linear amplifier.

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Rockford Fosgate M2 M282B Marine Grade 8-Inch Coax Component Speakers Black List Price: $399.99 Sale Price: $349.99 You save: $50.00 (13%)   Eligible for free shipping! Availability: Usually ships in 1-2 business days

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