The maximum power of the handheld radio is 8 watts. Therefore, the best antenna choice: there is no single "best" option; the best option is the original antenna that came with your handheld radio. Other antennas are unlikely to make a significant difference. Alternatively, you could choose a Yagi-Uda antenna, which will provide noticeable differences. Of course, if you really want to replace your antenna, you can start with the Hua Hong S518 or S518+, which are UV dual-band antennas that should be sufficient. If portability is not a concern, you could consider a telescoping antenna, as even a small increase in length can make a difference.
Is the power tolerance 10 watts or 70 watts? What's the difference? If your handheld radio has a maximum output of 8W, then there's no real difference between a tolerance of 10W and 70W. However, if your radio has a power output of 25W, you should choose a tolerance greater than 25W. In other words, the power tolerance must be greater than the transmitting power of your handheld radio, otherwise... the excess power will be converted into heat.
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