It is of course a mobile phone mast, not very convincingly disguised. Click the picture or its caption to go to a larger version where a box holding some of the electrics can be seen near the top.
Boletes are toadstool fungi which have pores rather than gills at the base of the caps, through which to release their pores.
This common bolete is one of the easiest boletes to recognise. The upper surface of the cap appears to crack, revealing pinkish or reddish flesh below.