Mount the antenna on the Port side along the top of the gunnel (when folded down) Either right next to the passenger or slightly forward. Lay it down pointing aft.
Mount the VHF on the the starboard side next to the helm area.
If you do it this way, the antenna will be far enough away from the VHF to NOT cause the VHF to stick on channels that are normally clear if you "scan" a few channels.
Done this for a long time.