Antenna dilemma

I had two masthead antennae for years on my old boat. I never noticed any poor performance from either the VHF or the AIS. We generally saw larger vessels at 50-80nm distance, and occasionally hundreds of miles, which I presume was some sort of atmospheric effect at work.
Are ais ariels not tuned to a much tighter frequncy than vhf ones anyway? So unlikely to interfere across most of the band?
Edit: just read post 19, ignore me:)
 
I found that RG8X was on special at the local chandlers. So I've got 80ft, enough to go from masthead to chart table without a joint.

Given this is almost certainly higher quality than what's currently on the VHF antenna, I'll probably swap the VHF and AIS around.

And now, to find connectors...
 
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