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VHF noise / squelch
Raymarine 55 VHF. Around the same time as I installed an antenna splitter to add an AIS transponder the VHF performance has dropped to nearly useless. Squelch needs to be virtually off to hear anything and even then there is background hiss.
Checked out the splitter and no apparent problems there so am now thinking coincidental antenna problem?
any advice on how one tests a VHF antenna?