Photos: Crave pays the BBC's R&D department a visit

The receiving antenna looks a little more sturdy, but once again you can see the two sets of elements offset from each other by 90 degrees.

Normally this antenna would be mounted on top of the van and driven around various test locations, where extensive reception tests would be performed.

If a MIMO system using polarisation were used to broadcast TV in the UK, you would need something like this to replace your existing roof-top aerial, as well as a new set-top box.