PAR base would be a turntable type structure situated midway between the two runway thresholds and ACR7 (424 in civil parlance) was mounted on a rectangular tower with sloping sides about 10 or 15 feet high. This looks like neither of those to me.
It does look a bit like a base for a portakabin type structure (especially with what looks like a power distribution panel visible) or a tank of some sort though.
Another possibility is a standby generator or 'B' Centre, but they're usually enclosed in a small brick building.
Last edited by chevvron; 7th August 2012 at 20:36.