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Good communication over the VHF Marine Band depends on antenna height, quality and dB Gain. This high performing Phase III™ marine antenna is a powerhouse providing all of those necessities in our rugged, high-strength, ethafoam spacer system, fiberglass radome for stability in high seas, high winds and high speeds. Silver-plated outer conductor, copper inner conductorStainless steel mounting sleeveType SO-239 connector inside mounting sleeve for easy mounting and dismounting for stowageSuggested mount: Shakespeare® Style 409-R or 410-R Mounting KitTwo sections: Base 110", Tip 110"Gain: 8dBBoat Length: 22'+