Behind each building was a 30.5 m ( 100 ft ) self-supporting tower that supported a four-section aluminum RCA " Pylon " tubular slot antenna, 16.5 m ( 54 ft ) high with a power gain of 6 . de Neuf's choice of RCA's FM antenna over GE's competing " ring radiator " was likely based on the Pylon's reduced exposure to the elements, which would lessen the chances for VSWR problems during icing conditions.