At least one contemporary media report, refers to a "giant police communications mast".
See Disbelief at the loss of 'honest, sensible and lovely fellow'.
Police guarded the entrance to the property, the well-tended gardens bounded by a high hedge and 10ft wall. A giant police communications mast, erected in the garden after Dr Kelly failed to return from his 3pm walk on Thursday, towered over the house which adjoins a converted stable block
Interestingly, Paul Peachey and other journalists who presumably saw the 110' high mast display a startling lack of curiosity about why it was there.