The Ku-Band is a portion of the electromagnetic spectrum in the microwave range of frequencies ranging from 10.9 to 12.75 GHz. Ku-Band is primarily used for satellite communications, particularly for satellite backhauls from remote locations back to a television network's studio for editing and broadcasting. Direct broadcast satellite signals occupy the upper portion of the Ku-Band, from 12.2 to 12.75 GHz.
... the Metropolitan Railway, the City and South London Railway and Underground Electric Railways of London) are now closed and, for the most part, abandoned.
Aldwych tube ...