Radio reception in band II (v.h.f./f.m.)

Despite an extensive literature on v.h.f. propagation dating from the Second World War, a search did not reveal data from observations collected over a sufficient period of years to justify assessment of long-term effects of tropospheric propagation. Acquiring this data has provided a useful appreciation of the consequences of unusual v.h.f. propagation, but, unfortunately, has not provided any solution to the problems. The investigation has, nevertheless, disclosed a marked change in the occurrence rate of tropospheric long-distance propagation from a 4 year period of significance to one of negligible proportions over the past year.