How do you make a VHF marine antenna directional?
"definer" wrote in message
oups.com...
I'm trying to get a land-based VHF marine monitoring station up and
need to make my antenna have some degree of directionality. I need to
know if there is a "simple" way for me get about a 180 degrees of
coverage versus 360 (in hopes of increasing my range in the right
direction).
The antenna (a 9db whip-type) will be mounted along side a
free-standing antenna tower and have a tip height of about 80 ft asl.
Without any directional feature that should give me a range of
somewhere between 16 and 17 miles (assuming the distant end antenna
height is 8 ft asl).
If there is aneasy way to make it somewhat directional and gain another
mile or two range (at least) that would be great.
Any ideas or am I "all wet?"
Ken
Use the tower as a reflector by mounting the 9 db antenna one half
wavelength away from the tower on the side of the tower in the direction you
want to signal to go.
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