The OP's sailing on a relatively small inland lake,
The OP specifically stated a range of 10 miles (didn't say statute or nautical) was desirable.
Per usual, in our rush to do good, we all want to recommend gear capable of safely crossing oceans,...
No VHF gear is much good for crossing oceans
... but might be overkill for the needs of his/her venue. ... Standard horizon has a nice floating model that does 6 watts.
With VHF, antenna height is more important than watts.
Example, from personal experience: Our antenna is mounted on the transom. Oft times, when a powerboat is having a conversation with the local Coast Guard station, we can hear only the CG side of the conversation. But when a sailboat
is talking to them (much less frequent, btw
), we can usually hear both sides. The difference, of course, is that powerboat antennas are usually just a few feet off the water, like ours is, while sailboat antennas are usually 30', 40' or more off the water.
I also have long experience with VHF and UHF from my Ham Radio days.
Trust me on this one: With VHF: Height is king. Some day I'm going to get an antenna at the masthead. It's just a question of time and money