ACFT EQUIP PROB RADIO LOST COM AFTER TKOF RETURNED TO LAND.

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AFTER TKOF; ALL COM RECEPTION WAS LOST. ALL ATTEMPTS TO RESTORE CONTACT WERE UNSUCCESSFUL INCLUDING 1) CIRCUIT BREAKER CHK 2) SWITCHING TO #2 COM AFTER REMOVING HAND MIKES FROM PLUGS. 3) TWEAKING PICKLE SWITCH. 4) TESTING SQUELCH ON BOTH COMS. 5) XMITTING IN THE BLIND AND LISTENING ON ALL NAV RADIOS AND ADF AT FULL VOLUME WITH EACH MIKE INDEPENDENTLY. THE FLT WAS KEPT IN VFR CONDITIONS AND 7700 AND 7600 WERE ON THE SQUAWK AT THE APPROPRIATE TIMES. TKOF WAS ON RWY 35L AND RETURN WAS ON RWY 26L. A WIDE PATTERN WAS FLOWN FOR ATC CONSIDERATIONS. THE TWR FLASHED A GREEN LIGHT ON BASE LEG FOLLOWED BY A CONTINUOUS A FINAL. AT TOUCHDOWN; LOUD STATIC WAS HEARD ON HEADSETS AND SPEAKERS AND COM WERE RESTORED. AFTERWARDS; A CALL WAS MADE TO THE TWR; AND IT WAS FOUND THAT ALL EMER XMITTERS FOR NAV AND ADF HAD BEEN MOVED TO DIA MUCH TO THE DISGUST OF THE TWR CHIEF. HAD THIS FAILURE OCCURRED DURING WX OR HIGH TFC VOLUME; I FEEL THIS COULD BE A POTENTIAL SAFETY ISSUE. AT LEAST 1 MEANS OF RADIO XMITTER NEEDS TO BE AVAILABLE FOR THIS CASE SCENARIO UNTIL THE MOVE TO DIA IS COMPLETE. STAPLETON IS STILL OPERATIONAL AND NEEDS THE SAFETY BACKUP.