The ARRL Antenna Book assumes ~10 ohms of ground loss
for mobile antennas. I've found that 12.5 ohms is the
lowest I can get for a 75m mobile antenna feedpoint.



Yes, but most mobiles are cars or pickups. Wouldn't you think that
losses might be less on a large vehcle like an RV or truck, especially
with such a high feedpoint as previously suggested ( 10 feet ) ?



Ed