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Aerial suspended optical-fiber links are being considered as economicalalternatives to buried links for long-distance transfer of coherent time andfrequency signals. We present stability measurements of an actively stabilized20 MHz photonic signal over aerial fiber links up to 186.2 km in length.Absolute frequency stabilities of 2.7x10^-3 Hz at 1 s of integration, and2.5x10^-5 Hz at 8x10^3 s of integration are achieved over this longest link.This stability is compared to that achieved over buried links for both radioand microwave frequencies. The results show that aerial fiber links are asuitable alternative to buried links for a wide range of frequency transferapplications.

Stabilized Modulated Photonic Signal Transfer Over 186 km of Aerial Fiber