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How to Use Walkie Talkies:
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The Nextel phones' "walkie talkie" (PTT) system sends its messages over the Nextel network, so if there's no signal it won't work. (Same for PTT on other networks.)
1. If its a metallic antenna, by that I mean the kind that the metal is showing, it shouldn't make any difference, unless it exposes the conductor within to the elements, then corrosion may have an effect over a prolonged period.
2. If its a rubberized antenna, you can get something to reseal the rubber. If its metal, maybe look into some rustoleum, of the right color of course.
If an antenna has a positive gain in some directions, it must have a negative gain in other directions as energy is conserved by the antenna. The gain that can be achieved by an Antenna is therefore trade-off between the range of directions that must be covered by an Antenna and the gain of the antenna. For example, a dish antenna on a spacecraft has a very large gain, but only over a very small range of directions - it must be accurately pointed at earth - but a radio transmitter has a very small gain as it is required to radiate in all directions.