NO,
in this case anyway,
If a station that should have been announcing 280m was instead announcing 290m, for 1071 kHZ, it would imply their radiowaves were approx 4% FASTER than the speed of light !!!
this 'forgotten 80s' song comes to mind, which I heard recently on a small radio station somewhere:
It would not have mattered if the announced MW wavelengths were slightly inaccurate, but surely not when they got wrongly positioned (wrong side of) relative to 'landmark' signals on the band, like 275, 285 (BBC) or 208 etc, so must have been very puzzling for people to have "290m" between 275 and 285
BTW, Radio waves are very very slightly slower in air than in a vaccum, so the wavelength in air is correspondingly very slightly shorter than the formula for in a vaccum. Much too little of a difference of course to matter with MW/LW wavelengths!
