Please note that online streaming service providers only supply the technical framework; they cannot issue licences covering neighbouring rights. You as the operator - i.e. the "maker" - of the web radio are responsible to obtain such a licence. 

To sum up: you need to follow these five steps in order to legitimately go "on air":

• Install the technical framework (studio, technical requirements) for your web radio.
• Register an online stream.
• Register your web radio with GVL (as well as with GEMA). Use the official GVL registration form to obtain a licence.
• If GVL has no objections relating to your registration, you may begin with your broadcasting activities immediately. GVL issues invoices to you on a quarterly basis (retroactively).
• If you cease to operate your web radio, you must terminate the GVL contract (and the GEMA contract); this is possible at the end of a month.