PLT THOUGHT THAT HE MAY HAVE ENTERED CLASS B AIRSPACE WHILE LOST. FLT DIVERTED.

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I PLANNED TO FLY FROM KISSIMMEE; FL; TO TALLAHASSEE; FL. EARLIER THAT MORNING; I GAVE MY FLT PLAN DETAILS TO A BRIEFER (I WAS AT MERRITT ISLAND AT THE TIME) AND WOULD OPEN IT WHEN AIRBORNE. THE PLANE (C172) HAD A HAND MIKE TO TALK; BUT I WAS USING HEADPHONES WITH A PRESS TO TALK SWITCH AND A 4-WAY INTERCOM. WHEN I DID MY RADIO CHK I DID NOT HEAR A RESPONSE. AN INSTRUCTOR CHKED THE RADIO AND INTERCOM AND FOUND IT TO BE WORKING OK. I TWICE HAD TO RETURN TO THE RAMP BECAUSE OF THE RADIO. EVENTUALLY; I WAS HAPPY THAT THE RADIO WAS WORKING WHICH WAS CONFIRMED BY MY PAX (AN ATP) AND WE SET OFF AND STAYED BELOW 1500 FT TO AVOID ORLANDO'S CLASS B AIRSPACE. I THEN TRIED TO OPEN MY FLT PLAN WITH ST PETERSBURG BUT THERE WAS NO RESPONSE. I THOUGHT THAT I WAS JUST TOO LOW AT THE TIME. I THEN TRIED CONTACTING ORLANDO WHO I COULD BARELY HEAR. I THOUGHT I RECEIVED A SQUAWK; BUT WAITED FOR A WHILE AS THEY SOUNDED BUSY. WITHIN ABOUT 20 MINS I WAS UNSURE OF MY POS. THE ONLY GND REFS APPEARED TO BE JUST LAKES AND SWAMPS AND ALSO; I NOW FOUND THAT BOTH VOR'S WERE NOT WORKING. I CLBED TO 2000 FT AND TRIED CALLING ORLANDO BUT NO RESPONSE AND I COULD NOT HEAR THEM XMIT. I THEN SQUAWKED 7600 ON THE XPONDER AND CALLED 121.5. AGAIN NO RESPONSE. I THEN TURNED W TOWARD THE COAST HOPING TO SEE ONE OF THE MANY AIRFIELDS. ON REACHING THE COAST THERE WAS JUST SWAMP. I STILL HAD 2 HRS OF FUEL AND FLEW E TO THE E COAST (45 MINS) ZIGZAGGING MY WAY BTWN RAIN CLOUDS. I DIALED THROUGH THE RADIO CHANNELS AND PICKED UP LAKELAND. THEY SAID I WAS UNREADABLE BUT ANOTHER ACFT PASSED MY XMISSION TO THEM; THAT I WAS LOST. I SOON REACHED ORLANDO AND CIRCLED ON THE OUTSKIRTS AS I WAS WORRIED ABOUT ENTERING THE CLASS BRAVO AIRSPACE. THE CTLR COULD HEAR ME BUT I COULD ONLY HEAR ABOUT THE FIRST 4 SECONDS OF EACH OF THEIR REPLIES; SO IT TOOK ABOUT 7 OR 8 XMISSIONS TO THEM THAT I WAS 15 MI W OF ORLANDO INTL AND THAT MERRITT ISLAND WAS ON A HDG OF 120 DEGS. HOWEVER; I SAW KISSIMMEE AND LANDED. I HAVE WRITTEN THIS RPT AS I MAY HAVE UNINTENTIONALLY ENTERED CLASS BRAVO AIRSPACE WITHOUT PERMISSION. I SPOKE WITH THE ORLANDO APCH CTL SUPVR LATER WHO WAS VERY HELPFUL AND UNDERSTANDING AND WAS PLEASED THAT I HAD LANDED AT KISSIMMEE (AND THAT A CTLR HAD ASKED ME TO LAND THERE ANYWAY; WHICH I DID NOT HEAR). THE SUPVR SAID THAT HE WOULD NOT BE RPTING THE INCIDENT AND SAID THAT HIS CTLRS WOULD BE HAPPY TO TALK ME THROUGH CLASS BRAVO AIRSPACE WHEN I WAS NEXT IN THE AREA. I AM NOT PLANNING TO USE TEMPORARY INTERCOM OR PRESS-TO-TALK EQUIP IN THE NEAR FUTURE.