 Following the second <unk> , Air Rhodesia created a system whereby the underside of the <unk> would be coated with low @-@ radiation paint , with the exhaust pipes concurrently <unk> . According to tests conducted by the Air Force , a Viscount so treated could not be detected by the <unk> 's targeting system once it was over 2 @,@ 000 feet ( 610 m ) . There were no further Viscount <unk> in Rhodesia . 
