Antenna
Small receiver in a small city (Ružomberok). Just a RTL SDR v4 connected to a raspberry pi 5.
Around 499 to 489 meters above sea level (in technical terms 20 m sloped long-wire (~10 m AGL, 499 m ASL).) 20m iron wire between 2 buildings as a antena.
HF mostly works during night (UTC +1)
20m good for sstv at night, adsb is good at day sometimes, you can also use this for listening to slovak fm and etc.