Letter from Thomas Gold to Dr Richard Wielebinski, School of Electrical Engineering, University of Sydney, Sydney Says that concern was expressed at the recent Arecibo [Ionospheric Observatory] meeting about their not having had any radio astronomy antennas from Dr Wielebinski. Asks what the current situation is as he had the impression a few months back that Dr Wielebinski was on the point of sending them the first one. 19 June 1967