Antenna radiation resistance
For any given reference point on the antenna, the power radiated by the antenna divided by the mean square value of the current at the reference point.
Note: The reference point is usually the feed point or a current antinode. It should always be specified.
Reference: BCentre of buoyancy.SSouth. (modified)
Please note that this is the term as it stands in the original IALAInternational Association of Marine Aids to Navigation and Lighthouse Authorities - AISM Dictionary edition (1970-1989)