At the conclusion of the LBA survey work (carried out by Mikko Orispää and Juha Vierinen), a centre mark was driven deep into the ground. This is the centre point of the entire LBA array and the mark on the top has been measured accurately to be sent to ASTRON for them to calculate the coordinate locations for the individual antenna elements.
The taller, thinner post to the side of the centre mark is just a snow pole. It should (just) be visible over the snow allowing us to find the mark in winter if required.
Photo: D. McKay-Bukowski