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gbj_tester
jellybaby
Depends on what if anything is between you and the transmitter and what your roof is made of but if the aerial is in the loft it will need to be bigger than one outside to account for the attenuation so as a starter look at how big the aerials of your neighbours are (count the elements to start with) and assume you need at least that big. Or maybe an amplifier but they can be a bit of a dark art.
Also look at where your neighbours aerials are pointing. Eg in Crouch End they tend to point at Ally Pally as there is a hill in the way for Crystal Palace. Based on your table you want a group A or a wideband aerial and to mount it horizontally. Get the biggest thing that will fit in the loft.