SMA HAS UNAUTH PENETRATION OF AIRSPACE DUE TO LOST COM.

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I WAS ON A VFR FLT PLAN FROM PBF TO F12 (RUSK CO). WHILE ENRTE I DECIDED TO LAND AT GREGG COUNTY INSTEAD; AS RUSK'S FBO WOULD BE CLOSED BEFORE I ARRIVED. I TUNED IN GGG'S ATIS APPROX 25 NM OUT; AND HEARD NOTHING. I BEGAN TRYING TO CONTACT GGG APCH CTL ABOUT 20 MI OUT; BUT RECEIVED NO RESPONSE AND HEARD NO XMISSIONS. I THEN TRIED THE TWR FREQ AND AGAIN HEARD NOTHING. WHILE ATTEMPTING TO DIAGNOSE THE RADIO PROB I INADVERTENTLY FLEW WITHIN 4.7 MI OF GGG; VIOLATING THE CLASS D AIRSPACE. WHEN I REALIZED MY ERROR; I IMMEDIATELY TURNED AWAY FROM THE ARPT AND DIVERTED TO GLADWATER; TX. I BELIEVE THE CAUSES OF THE PROB WERE AS FOLLOWS: RADIO NOT FUNCTIONING PROPERLY. SINCE I HAD USED THE RADIO AT THE PREVIOUS LNDG POINT (PBF) TO ACTIVATE MY FLT PLAN; I HAD NO REASON TO BELIEVE IT WOULD MALFUNCTION. THE TEST BUTTON SHOWED THE SQUELCH TO BE FUNCTIONING PROPERLY. I BELIEVE THAT THE PROB WAS CAUSED BY SHIFTING BAGGAGE HAVING DISLOCATED THE ANTENNA WIRE; CAUSING IT TO BECOME DISCONNECTED. PLT'S UNFAMILIARITY WITH THE AREA. PLT FATIGUE; CAUSING INATTN TO POS WHILE BEING DISTRACTED BY A RADIO PROB AND HAVING TO FIND A NEW DEST TO DIVERT TO. LESSONS LEARNED -- SECURE ANTENNA CABLE SO IT CAN'T BE DISCONNECTED BY SHIFTING BAGGAGE; PAY CLOSER ATTN TO POS WHEN IN THE VICINITY OF A CTLED FIELD.