What was found
BLEED OVER FROM NR 1 COMM 120.400 TO NR 2 COMM 132.000. BLEED OVER OCCURS WHEN TRANSMITTING ON 120.400 ONLY. BLEED OVER IS VERY CLEAR AND DISTRACTIONG ON THE NR 2 COMM. OUTSIDE THE SCOPE OF THE SL. RETURNED TO FIELD. LANDING UNEVENTFUL. R & R VHF NR 1 AND VHF NR 2 TRANSCEIVERS AS PRECAUTIONARY MEASURE IAW AMM TASKS 23-11-01-000-801/400-801. WHILE PERFORMING GVI OF NR 1 AND NR 2 VHF COMM ANTENNAS FOUND HAIRLINE CRACKS AT BASE OF NR 1 ANTENNA. R & R NR 1 VHF COMM ANTENAS IAW AMM TASK NR 23-11-00-710-801. CONTACTED FOR DEPARTURE ON FREQUENCY 120.400 SEVERAL TIMES WITH NO BLEED OVER. ACFT OK FOR CONTINUED SERVICE.