Therefore transmisssions with adequate power and separation “frequency wise” from other stations whether they are on sstv or simply Phone chatters will help enormously.
Filters in receivers do not always manage to leave enough signal bandwidth for good results although DSP does help get rid of close in interference at times . Some folk use Noise Phasers (QRM eliminators ) but these are expensive and do not always give good reception. Of course on VHF and using FM especially most of the above simply doesn’t happen.It all down to where Your interest lies I guess I enjoy 80 metres as its always a challenge getting good pictures <grin>
The 20 metre band does often give good strong signals with the obvious DXer in mind BUT it seems many Stations do not listen or receive they just switch on and transmit
This is NOT the way to operate SSTV even if You like me have a Linear !!