IMHO the higher the better, BUT depending on how high you should start consider the coax loss. In our boat we installed a second VHF antenna
on the mast head
, (85'), we can see Class A AIS
ship very far, but usually we are not able to be seen further than 15 to 20 miles, due to the fact that our Class B transponder has an nominal output of only 2 Watts. So if you put the antenna
very high use the best low loss coax and the best connector to bring most of the power to the antenna.
Sent from my Nexus 10 using Cruisers Sailing Forum mobile app