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While I agree that the best point to measure is right at the feedpoint sometimes that is not possible or practical so therefore multiples of 1/2 wavelength of cable is indeed the way to go since the feedpoint impedance is repeated. Most antennas do not tune properly when mounted within arms reach of the ground and must be raised some distance to be properly tuned if one is at all interested in the actual impedance and not simply SWR. Most of the time this involves being physically located some distance from the antenna. Standing in the middle of a pair of stacked 2m or 70cm antennas while trying to tune them is not a great idea because of detuning.

[QUOTE="Captain Kilowatt, post: 541189, member: 39"] While I agree that the best point to measure is right at the feedpoint sometimes that is not possible or practical so therefore multiples of 1/2 wavelength of cable is indeed the way to go since the feedpoint impedance is repeated. Most antennas do not tune properly when mounted within arms reach of the ground and must be raised some distance to be properly tuned if one is at all interested in the actual impedance and not simply SWR. Most of the time this involves being physically located some distance from the antenna. Standing in the middle of a pair of stacked 2m or 70cm antennas while trying to tune them is not a great idea because of detuning. [/QUOTE]

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