Space wave propagation frequency is nothing special, it is the same frequency of the wave in question, for example WLAN Wifi produces 5.2 GHz radio wave from your computer or from router, so that would be the the space wave propagation frequency in question

Extremely high frequency (EHF) and SHF

Beacon frequency refers to the amount of space that beacons can reach. The beam coverage is measured to determine its frequency.

What is the Diffeence between the In band and Out of Band Frequency Diversity

Actually, radio waves do go out into space. However, depending on frequency, they do tend to bounce off of the ionosphere, which is why lower frequency waves such as AM and longwave have greater (on Earth) range than higher frequency waves, such as FM or microwave.