The spectrum around 5GHz in Downtown Athens

A large ~8-10dBi ( larger would make the vertical radiation angle too small ) omnidirectional antenna,
a descent 5GHz radio card, and a RouterOS powered computer
are good enough to look at the spectrum around the ~5GHz unlicensed in Greece Frequencies.

The command:
/interface wireless spectral-history 0 range 4790-6110

and this is how it looks.

The Spectrum around the 5GHz in downtown Athens