The antenna array on top of the water tower is very interesting. The picture of the "Yagi" antenna is actually a
Watkins Johnson Log Periodic Wideband Receiving Antenna. In the form shown it apears set up for DF "direction finding."
Going by the size of the elements the frequency range is 500 Hhz to 2 GHz.
This type of antenna is only used for "surveillence receiving aplications by Military and OFCOM".
The receiver to go with this equipment must have been fitted locally and controlled via a modem from somewhere like GCHQ.