@eikenberry @w8emv

Look at https://dxmaps.com to get way too much information. Different bands have different DX characteristics, and signals can vary minute by minute.

For ham radio I have sense for 2 meters, especially how Ohio repeaters can be heard / can interfere with local repeaters. @W8HF in Elyria OH can sometimes hear the U of Michigan #W8UM repeater which is on the same frequency as his.

Good antennas help too, e.g. a directional antenna pointed the right way.