You should have seen how the "professional idiots" installed the antenna wire on the Naval Academys new fleet of "Navy 44's". Tuner located on port side forward bulkhead of lazarette, exit hole deck fitting on starboard side aft near chainplate for the split backstay. GTO-15 run from tuner output inside wire loom with radar
and GPS cables
for about 12' before exiting wire loom. I have relocated the deck fitting to the port side and run the GTO-15 well away from the other wiring
but still have about 5' of cable inside lazarette. The list of poor installation practice on these boats is lengthy. BTW, modern tuners are quite weather
resistant and survive just fine in the lazarette and will survive equally well above deck as long as the cable entrance fittings are properly oriented.