Similar problem with a boarded attic too hot in summer, too cold in winter.   
Fix:  (1) remove any lining to expose underside of the roof tiles   (2) Spray 
125mm (4")  of polyurethane expanding foam over the tiles.  This (a) locks the 
tiles & prevents any roof movement (b) keeps out any dust (c) warm in winter  
(d)  cool in summer  (e) reduces your heating costs.   It is a recognised 
building treatment & several companies will quote for the work.  Best done in 
summer as fumes can persist for a week or two.

Final thought:  if you can put in a velux double skin opening window in the 
roof with a 180 deg. opening –– preferably near a chimney stack.  You can then 
get at and mount antenna from a pair of steps through the window.  You need to 
install the window before you get the spray.  
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