Pattern Measurements of Large Fixed Antennas

Successful pattern and gain measurements can be made on large fixed antennas by the use of an airplane. Careful instrumentation and some training of the personnel involved are required. Accurate pattern shape data is more easily obtainable than direct gain measurements of comparable accuracy. Clear weather and good visibility are required except that low angle beams may sometimes be measured under an overcast. For high angle work, night tests provide the best visibility.