The article below was published in the Radio Times on 9th December 1949. It explains how the Sutton Coldfield transmitter will bring television to the Midlands, when it begins broadcasting on 17th Dec 1949. The map shows the area covered by the transmitter, with the main transmission area being within the 50 mile radius.
copyright resides with the original holder, no reproduction without permission
https://www.transdiffusion.org/2016/12/17/television-comes-to-the-centre-of-england