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5ft. (1.5 m)
A lot of parabolic reflectors are used in antennas, particularly with frequencies in the microwave region. There are a few other shapes, but they are infrequent choices for antenna designers.
I lightning rod varies in size. Most are found on top of building in areas that are known to have lightning activity. They are shaped like antennas and sometime have a sphere at the top of the bar.
most head units have a wire on there plug for power antennas, so as long as you hook the plug up right you should be alright! Good luck!
That's a real variable. By that, I mean that it depends on the RF output power of the repeaters in watts, the receiving system's sensitivity, AM/FM, whether or not you're using directional antennas, terrain conditions, weather conditions, etc. Without more info, that's the best I can do.