Free at RFSee
RFSee contributes to some non-profit activities that have a strong relation to RF and Radio communications. As a result of these activities some free data if available on this website.
Data that can be used in combination with Radio mobile can be found at radiomobile.rfsee.nl.
The Radio Mobile Tutorial and knowledge database is at radiomobile.pe1mew.nl
The Things Network
TTN Apeldoorn is a active comunity on IOT in The Things Network. Various of their activitites are supported by RFSee. The result of this work can be found at iot.rfsee.nl