This may be where the claim originates, but it was also in my personal experience the strongest signal too (in London).
Even Mary Payne wrote in her diary on 14-June-67: "Could only get Radio 390 on the crappy radio" in the common room on a work course in Stanmore.
Incidentally, I thought the aerial height was now considered to have been 160 foot high because of the 16 x 10-foot sections identified from photographs.
Ian, are 160.
It says "It later became Radio 390, Britain's most powerful offshore pirate". Hmmmm, the Italian built RCA BTA10J was run at about 6kW, with low modulation, into a 150 foot mast, with top guy radials, that was possibly 50% efficient, at best.
I Found this interesting interview:
https://archive.org/details/PaulPetersMeetsBobGrahamOf60sPirateStationRadioInvictaRec.Spring2012
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