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Cellphone Masthead Antennas
Shakespeare makes a very good cell amp, and marine mast-mounted antenna. The cell amp acts as a cell phone repeater, in that you can use your cell phone normally, anywhere in range of your amplifier (as can others too, so turn it off when not needed). They advertise 3W output into Very Low Loss cable, also available from the same place (West Marine, Defender, eBAY ETC). This power will increase your over-water range to about 50 miles from the tower.
You asked about the low loss cable needed.
The output signal, at the frequencies in use here, will be easily attenuated by inferior cables. Basicly, the transmitted signal is dispersed over the cable''s dielectric itself, leaving very little for the antenna to work with. Gigahertz signals (which these are), use air or other hi-air content cables to transmit their signals.
So use the best cable available. Do not bend it much or crimp it, as this will disturb the air dielectric of the cable, causing loss due to impedance mismatch at the constricted point.
I know, a lot to soak up. To be safe..simply go with what Shakespeare recommends.