I set a challenge to members of the British Amateur Television Club (BATC) to transmit TV pictures using a LimeSDR Mini barefoot - without any amplifiers (just an output filter and an aerial). Dave, G4FRE reports that he has now achieved a distance of 35 km on 1255 MHz (the 23cm Amateur band).
On transmit, he used the BATC Portsdown system (a Raspberry Pi driving a LimeSDR Mini), and on receive he used a preamp, Analog Devices Pluto and a PC running SDRAngel. Very impressive for 5 mw output power!
Full details of the Portsdown system here: BATC Portsdown Wiki.