In my original set up I used two portable scanners that covered a wide range of frequencies. These scanner were plagued with interference from other radio bands. I purchased a fixed mount Standard Horizon VHF radio. This is the same type of radio you will find on a boat. This type of radio is only used for the marine band and filters out the interference found with a scanner.
My antenna is a directional
unit tuned to 156.500 MHz. This is mounted on my roof to a Radio Shack antenna rotor. I
use RF 9913 cable to feed the signal into my house. In my opine the cable is the most
important part of the set up. RF9913 offers the lowest signal loss figures: 1.6dB per
100'@150 MHz. I found my antenna and cable through :
VHF radio signals are line of sight, this limits the range to around 50 miles...in theory. I live on a hill and that helps. Reception is best during the summer months with a usual range of 50-60 miles in a 180 degree arch (so much for directional). A condition exists around bodies of water called Troposphereic ducting, it is possible to receive signals from hundreds of miles away. The atmosphere over the water acts like duct work carrying the signals. This condition seems to peak with high temperatures and high pressure centers. Many nights during the summer I receive all the way to the Welland Canal into Lake Ontario, both side of the conversation! Some Coast Guard stations use remote transmit\receive sites to increase range, they can cover a very large area that other wise would be out of reach.
Please email with questions or if you can add to any of my explinations. firstname.lastname@example.org
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