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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