Statistical results from radio signal strength Measurement Campaign over two over-sea paths in Channel Islands, UK

Previous studies on anomalous, over-sea propagation have been either focused on single links employing space/antenna diversity or on point-to-multipoint links, usually involving single frequency. Measurements on two co-linear, trans-horizon paths (50km and 140 km long) over the English Channel have been made over periods in excess of a year in order to investigate the propagation characteristics of VHF and UHF signals propagating over the sea. The setup comprises a transmitter located on Jersey and receivers on Alderney and Portland. Signal strength enhancements have been observed on both paths, occurring for different percentages of time between 12% and 19%. UHF signals show greater magnitude of signal level enhancement and longer link shows greater degree of signal level enhancement.