That image is the LHR Marconi 264 atop of the BA staff car park in the BA maintenance area east of the terminals and yes, that with the other three 264's did cause TV interferance which is why we no longer use the 50cm band. The body responsible for frequency allocation, the ICU decreed in the mid 70's, the closure of the 50cm to civil radars. The TV band overlapped the 50cm band hence the interferance so all users of this band were made to discontinue usage, the 23cm and 10cm are the lowest bands available for civil radar. This happened in the late 70's into the 80's to allow withdrawal and installations of radars, the LHR 23cm became operational about 1984/85. The BA car park radar was replaced by the EN4000, a hybrid of AR1 Tx/Rx, Marconi 7113 processor and a Cossor ACR6 aerial.