You could substitute a full size antenna for the little bitty stub antenna supplied with the transceivers. You could even substitute a larger tuned antenna (like a Yagi) for even more range. You can always get much much better range with a better antenna.
Do remember that using a larger antenna is illegal. If you cause interference, you're the one at fault and you can be forced to stop using it.
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Do remember that using a larger antenna is illegal. If you cause interference, you're the one at fault and you can be forced to stop using it.