I'm also considering an AIS install on my B40. Can't decide is a VHF splitter or a separate VHF antenna is the best way to go. Obviously the splitter is the easy route but the fact that the VHF antenna is "tuned" to the radio and not best optimized for the AIS and the fact that hey share makes me wonder if this the best solution. But, I'd be happy to not have the hassle of pulling cable from a new antenna.
Any advice? Plan to use a Raymarine transceiver, existing kit is Ray E80 and all the other nomad Ray items.