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It has been proposed that the existing sites and structures of the Post Office line-of-sight radio networks should be utilized to facilitate the introduction of a t.d.m. overlay network in the frequency band 10.7Â¿11.7 GHz. Those sections that suffer the greatest variations in propagation characteristics owing to their length may need a diversity system. This paper shows that at 11 GHz and at the bit-rates being considered and using phase-shift-keyed modulation, it is possible to use phase-control height diversity which is an economic and effective diversity system used in the frequency modulated radio network.