Island Images - The Isle of Man in Pictures
This is the WW2 radio site.  After research by Chris Corkish we think it's a Radio Track Beam site, an allied copy of  the German 'bombing beams' but used instead for homing returning aircraft. Judging by the distance the aerial was sited from the accomodation, it must have radiated a very high power.
 
 An Island Images picture  © Jon Wornham