The antennas nominal gain applies only in the direction of the main lobe, ie. not towards your head. A typical Yagis strongest sidelobe will be well into the ne

The antennas nominal gain applies only in the direction of the main lobe, ie. not towards your head. A typical Yagis strongest sidelobe will be well into the negative dB. Also, both the consumer hardware 100mW limit and the 4W PTP limit are EIRP (in the US; apparently; I'm from Germany), so the gains don't matter. And you achieve them with very directional antennas (which are hard to aim by hand), not with a strong transmitter. Radio range is not the problem at all when aiming by eye - because your target is small, it's line of sight, and the pilot is likely not using a very strong transmitter and a very directional antenna.