Post History

I can think of a couple of reasons:

- Lower frequencies mean superior range at the same output power. Whereas for example 2.4 GHz technologies tend to behave much more "directional" on short ranges, they are basically line of sight and don't handle obstructing objects/terrain between sender and receiver well.

- For the above reason, you can get away with worse receiver sensitivity, meaning a cheaper product.

- The bands 26.957-27.283 MHz and 40,660-40,700 MHz are license free (up to 10mW E.R.P) in the whole of EU and likely in many other countries too.