  The proof of the pudding is in the eating - that is why 6G testbeds are
essential in the progress towards the next generation of wireless networks.
Theoretical research towards 6G wireless networks is proposing advanced
technologies to serve new applications and drastically improve the energy
performance of the network. Testbeds are indispensable to validate these new
technologies under more realistic conditions. This paper clarifies the
requirements for 6G radio testbeds, reveals trends, and introduces approaches
towards their development.
