I believe you’re referring to the Fresnel region in the radiative near field close in to an antenna, rather than the Fresnel zone in the far field. But this is a moot point, and interests only those who have studied such stuff in great detail - which neither of us has done, right?
I realised from your comment Rob the Satellite Map obtainable in line via Google is pretty much up to date. The aerials were only installed on 24 June 2018 so the image is later than that. I can’t date it exactly but sometime from then onwards.
Sorry for not being an active part of this conversation, I’ve been busy running a vintage computer event in the Windermere today. Anyway, I am a lot more ‘amateur’ than the rest of you, so will just comment that it has been a fantastic conversation and very interesting and informative!
Back to PDPs, VAXen and other DEC kit tomorrow for a day before normality resumes…