Quote:
Originally Posted by ofer
Practical
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It also depends on sea conditions. A high gain antenna is too directional in heavy seas. I have both a 6db and 9db on my boat. Most of the time, performance is comparable. Sometimes, with the 9db, I can get 80 - 100 nm (I have heard the whole line of sight thing, but there is also ground wave propagation in some conditions -- especially over open sea with no land or buildings to interrupt propogation). Sometimes, the 9db comes in broken while the 6 is just fine.
As to the height aspect, there are rapidly diminishing returns to additional height. Basically proportionate to the square root of height. So, the 40' antenna can only "see" about 15% further than the 30'