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The gain of a horn-reflector antenna with an aperture area of about 400 square feet has been measured with a probable error of 2 per cent at a frequency of 4080 mc. Errors and fluctuations normally introduced into gain measurements by terrain and other environment were obviated by mounting the source on a helicopter which maintained a position about 2500 ft. above ground at a distance of one mile from the antenna under test. It is concluded that high precision can be obtained in measurement of gain of large antennas using such methods.
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Hogg et al. (1965) studied this question.
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