Rob,
Kevin stated correctly, that you will need a directional antenna and attenuators or a variable attenuator. An in-line analogue signal strength meter is also very usefull. I used my VX-6R last year, during my successful L-2 flight. I had a 3 element arrow yaggi antenna. I didn't yet have an attenuator. So I utilized a trick I learned when DFing ELT's. When I got close, I disconnected the antenna. WARNING: Do Not Transmit without an antenna. A loop antenna is more directional than a yaggi; so I plan to buy one, and a set of in-line attenuators. There are some other helpful tricks, like body shadowing to determine if the signal is in front or behind. Another trick I tried with limited success was utilizing the top null of a whip. Most whip antennas have a radiation pattern like a doughnut, with a null on top. So theoretically, if you pan the HT horizontally, you should have a null, when pointing the whip antenna directly at the RF source. Max Mc in Medford
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