DEPARTING GTR; BE9L MISCHANNELS UNICOM FREQ AND FLIES OVER GND CREW RWY PAINTING.

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HAD LANDED AT THE ARPT (GOLDEN TRIANGLE; COLUMBUS; MS) FOR FUEL. UNICOM HAD ADVISED OF RWY PAINTING OPS IN PROGRESS; AND HAD CREW EVAC RWY BEFORE LNDG. AFTER REFUELING; WHILE TAXIING OUT; I MADE RPTS ON WHAT I BELIEVED TO BE THE UNICOM FREQ. I RPTED TAKING OFF; BEGAN THE TKOF ROLL; AND AS I APCHED THE CREST OF THE RWY (IT HAS A SLIGHT CREST IN THE CTR); I SAW A PICKUP TRUCK ON THE L MARGIN OF THE RWY AT THE FAR END. AS I APCHED ROTATION SPD; I SAW THE PAINT CREW HURRIEDLY LEAVING THE END OF THE RWY. APPARENTLY THEY HAD BEEN PAINTING ON THE FAR END AND HAD NOT SEEN OR HEARD ME BEGIN MY TKOF. I HAD NOT SEEN THEM OR THE PICKUP UNTIL TOPPING THE CREST. AFTER I WAS AIRBORNE; I CHKED MY RADIO; SAW THAT I WAS SET TO XMIT ON THE RADIO TUNED TO ATC (THE #2 RADIO WAS SET TO UNICOM). I CHANGED TO UNICOM; AND ASKED IF ANYONE HAD HEARD MY TKOF RPT. A MAN RESPONDED WITH 'WE DID NOT.' APPARENTLY HE WAS A MEMBER OF THE PAINT CREW WITH A HANDHELD RADIO. THE RWY IS LONG ENOUGH THAT AT THE TIME I SAW THE PICKUP; AND BECAUSE IT WAS WELL TO ONE SIDE; I CONTINUED THE TKOF BECAUSE I WAS NEAR ROTATION SPD. BY THE TIME I OVERFLEW THE FAR END OF THE RWY WHERE THE CREW HAD BEEN WORKING; I WAS A GOOD 150 FT ABOVE THE GND. ADDITIONALLY; I HAD BEEN TALKING TO WHAT I THOUGHT WAS ATC CLRNC ON THE #2 RADIO. THIS LED ME TO THE ASSUMPTION THAT I WAS ON #2. I MUST HAVE BEEN IN FACT TALKING TO COLUMBUS APCH ON THE #1 RADIO. WHEN I SWITCHED TO UNICOM (BACK TO UNICOM; THAT IS) I ASSUMED I WAS STILL ON #2. I DON'T KNOW FOR CERTAIN IF COLUMBUS APCH CAN BE REACHED FROM THE GND AT GTR ARPT.