Originally Posted by Squidly-Diddly
I've got some vague idea that freq = speed of light/wave length, and that by some electronic wizardry a little radio can broadcast on a wide range of freq without needing to physically shorten or lengthen its antenna.
It is very simple. For maximum performance an antenna must resonate at a particular frequency. If you are satisfied with less than maximum and/or want a shorter antenna, a coil is added in the base, if you want to cover two frequency bands, two different coils are added.
In your example the radio works reasonable well in the 2 meter and 70 cm band.