What was found
DURING APPROACH, ALL NAVIGATIONAL RADIOS LOST. AIRCRAFT HAD MODERATE ICING AT THE TIME. CDI NEEDLES WERE ERRATIC DURING PREVIOUS HOLDING PATTERN. CHECKED NAV ANTENNA SYSTEM FOR CONTINUITY AND SYSTEM CHECKED GOOD. CHECKED NAV ANTENNA COAXIAL CONNECTIONS IN AFT BAG BIN FEED THROUGH. CLEANED COAXIAL CONNECTIONS AT NAV ANTENNA ON VERTICAL STABILIZER. CHECKED GOOD, REPLACED NR 1 AND NR 2 NAV RECEIVERS. SYSTEM OPS CHECKED GOOD IAW DC-9 MM 34-32.