It was recognised that leader cable would be impractical at some airports, but that it could be dispensed with if improvements could be made to ILS. Some improvement resulted from a narrow beam localizer aerial system developed by BLEU during the early 1950s[34] and by 1958 automatic landings had been made using only ILS localiser for azimuth guidance.[35] That required a good site but by the early 1960s radically new aerial designs for the ILS transmitters developed by Standard Telephones & Cables (ST&C) improved ILS to an extent that leader cable could be dispensed with.[36]