On Thu, 12 Dec 2013 20:31:35 +0000, Nightjar wrote:

On 12/12/2013 19:12, mogga wrote:
We're getting some new street lights and have noticed they have little
antennas on the top.

What is it for? ...

Mind control - time for the tin foil hat.

Colin Bignell

There's a new system coming out for early detection of failing lamps for
seamless replacement by use of the 'distress signals' they emit in the RF
spectrum shortly before failure. These signals are visible on handheld
spectrum analyers which can be driven around in vans checking the
'health' of such lamps; the antennas enable the distress signals to be
detected from further away, thereby shortening the route taken.