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On a walkie talkie, the antenna is usually marginally better than a dummyload and sometimes a dummyload is better. If you plan to use in a fixed position, you can try a diversity antenna system, even connect to a yagi. Rememeber that on a commercial radio system, changing the antenna is not legal, as the radio will no longer be FCC certified under some services.
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.
No, it won't hurt its performance. Those antennas are meant to take that kind of abuse. Hope that helps.
