View Single Post
  #5   Report Post  
posted to
Bruce in Alaska Bruce  in Alaska is offline
external usenet poster
First recorded activity by BoatBanter: Jul 2006
Posts: 153
Default How do you make a VHF marine antenna directional?

In article .com,
"definer" wrote:

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

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?"


There are a number of antennas and mounting configurations that will
do what you want. Most are expensive but if your in the commercial
end of things it is just a business cost. Go find a "good" Land/Mobile
Radio Engineer with design experience, and pay him to do the design
right. You won't be sorry......

Bruce in alaska who used to consult a lot, in a past life......
add a 2 before @