Put X axis ticks at exact MHz values

[argilo]

The X axis of the scan plot is unwieldy, with hundreds of tick marks and odd frequencies displayed:

Providing a fixed list of frequencies cleans things up nicely:

I included frequencies for both the 403 MHz and 1680 MHz bands. For the 1680 MHz band, I chose a 2 MHz spacing to avoid having too many labels when the full 1675-1700 MHz band is scanned.

[darksidelemm]

This is certainly an improvement! I think i'd prefer 0.5 MHz steps for the 400 MHz band though - that should be easy enough?

[argilo]

Yes, that's a simple change. Done.

[argilo]

It looks like there's enough room for the U.S. 400-406 band even on mobile: