Which kinds of radio telemetry equipment require a licence from the government?
All wireless data equipment installed on a private band (i.e. for the exclusive use of a single user) requires a government licence. Generally, all band frequencies for the transmission of data are licensed. However, there are certain free (unlicensed) frequencies, around the 433 MHz and 868 MHz level (Europe, ITU Region 1), 929 MHz (America, Australasia, Asia ITU regions II and III), and 2.4 GHz.