Official communication from the Belgian Institute for Postal services and Telecommunications (BIPT)

Authorization for use of radios.

Every user of radio communication equipment is obliged to be in possession of the authorization title to use his equipment on the circuit of Spa-Francorchamps during the meeting of the Spa Summer Classic.

Controls will be carried out by the BIPT at Spa-Francorchamps and, in the event of non-compliance, may result in legal proceedings and seizure of radio equipment.

It is therefore imperative to introduce the requests for obtaining the required authorizations via the BIPT website
http://www.bipt.be/en/consumers/radio/radio-networks/mobile-networks

BIPT also reports that the equipment used must comply with the regulations.
http://ibpt.be/en/consumers/radio/equipment/terms-of-use

Some companies would provide non-compliant equipment.
One of the sine qua non conditions for a material to comply is that it bears the CE marking.
Pay attention, the "CE" marking should not be confused with the label "China Export":
Any non-compliant equipment will be seized by BIPT.