National Physical Laboratory

CAI digital TV aerial benchmark testing

Outdoor Ground Plane 

The Confederation of Aerial Industries (CAI) has been set up by representatives of UK television aerial manufacturers to govern a voluntary benchmark scheme which aims to standardise the performance of commercial digital TV aerials.

NPL performs the benchmark testing on the (60 m by 30 m) ground plane.

The benchmark procedure consists of 5 tests:

  • forward gain
  • polar pattern
  • cross polar
  • return loss
  • feeder pickup

By request we offer a site hire facility, which allows manufacturers to develop their aerials prior to the formal benchmark test. This service is charged at a daily rate.


Customer Service tel: +44 20 8943 6796

Last Updated: 25 Mar 2010
Created: 17 Apr 2009


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