Use existing cable conduits, if you can
Hi Fred,I recently installed a VHF in my 1999 260 and here is my experience.First of all, I mounted the VHF radio just aft of the compression post in the cabin, attaching the braket to the aft most access plate there. The Mast head antena is connected to the radio by a continuous cable run with connectors on each end: one at the attena, one at the radio. A short section of PVC pipe was used to enclose a hole through the deck at the base of the mast. The cable is fed through PVC end cap with a hole in the center (before installing the connector). Another end cap is used to seal the through deck pipe when the mast is down.This was done to minimize the number of cable connections which are a source of signal loss. It also minimized the cable run between radio and antenna.Near the compression post there are two access panels, take them off and look around. I found an unused conduit terminating behind the forward most panel. It has a string for pulliing a cable, but couldn't find the other end. The existing mast and cabin lighting power wires are not run through conduits and I found them to be tightly wedged between the liner and hull in tight places. I discounted using them to pull additional wires.I pulled the conduit end out of the aft access hole (of the two by the compression post) and pulled it straight for a straight run with an electricians snake. Ended up cutting about 10" off the conduit to make it more managable.Turns out that the other end of the conduit terminates at the molded in section of the hull behind the aft, starboard stanchion, beyond reach. This end of the conduit is almost totally blocked becuase it is up againts the recess in the deck. The closest you can get is the tiny access panel above the galley. While you are there, remove the overhead access panel (below the starboard winch) and the electrical panel.** Note to Hunter -- install the conduit so that it terminates back a few inches away from the stanchion base, and lead the wire pulling string back to the electrical panel.After much jiggling and pushing, I did manage to get a snake to go through the conduit, feed from the forward end, and got it to pop out the blocked conduit over the galley then on to the panel.For the run from the panel aft, there is another conduit, but alas, the far end seems to be blocked by foam. I have not yet got through it. The existing wires from the battery to the panel seem to also be imbedded in the foam, so they can't be used to pull a string through, either. I haven't yet solved this but am ready to call RotoRooter to get through the foam. ** Note to Hunter -- A little extra care in planning the conduit run and/or blowing the foam would make wiring runs less challenging for the customer.Good luck and fair winds...Tom