HF Spectral Occupancy dependence on antenna elevation angle

High frequency (HF) spectral occupancy data have been collected for four months by the two components of a R&S HE 016 antenna which is capable of receiving HF signals at both low and high incident angles. In an effort to develop models to describe different occupancy characteristics for these two antenna components we examine signals that are received at angles for which both antenna components are sensitive. This enables the examination of the correlation of signals received by these two different antenna components and how this correlation varies as a function of frequency across the HF spectrum. This corresponding analysis will eventually determine whether there is a benefit to introduce elevation angle as a model parameter to existing low-angle model formulations in order to better characterize the HF interference environment over the eastern Mediterranean region.