A C560XL ON THE GND AT PLN REQUESTED CLRNC FOR FUTURE TKOF BUT ATC MISUNDERSTOOD AND BLOCKED AIRSPACE FOR THEM BEFORE ACTUAL DEP. POOR RADIO COVERAGE AT PLN WAS A FACTOR IN THE MISCOM.

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THE FO WAS GETTING THE ACFT READY FOR OUR NEXT FLT. I WAS INSIDE THE FBO WAITING FOR OUR PAX. I RECEIVED A CALL FROM DISPATCH TELLING ME TO CONTACT ATC. I PAGED MY FO AND TOLD HIM TO CALL ATC. I LATER FOUND OUT THAT HE HAD BEEN GIVEN A CLRNC AND WAS TOLD 'ADVISE WHEN AIRBORNE' BUT HE BELIEVED THAT IT WAS A 'HOLD FOR RELEASE' CLRNC. WHEN HE FINALLY CONTACTED ATC HE WAS TOLD THAT ATC WAS TRYING TO GET IN CONTACT WITH HIM AND HE HAD BLOCKED THE AIRSPACE FOR IFR TFC FOR OVER 30 MINS WHILE WAITING FOR OUR DEP. THE FO TOLD ME THAT HE WAS HAVING DIFFICULTY COMMUNICATING WITH ATC. HE STATED THAT HE WAS ABLE TO HEAR ATC ON THE GND BUT HAD TO HAVE AN ACFT AIRBORNE RELAY HIS MESSAGES. I BELIEVE THAT RELAYING MESSAGES BACK AND FORTH TO AN ACFT WAS THE MAIN REASON FOR THIS BREAKDOWN IN COM. WHEN WE WERE FINALLY READY FOR DEP; I WAS ABLE TO SEE FIRST HAND HOW DIFFICULT IT WAS TO COMMUNICATE WITH ATC ON THE GND. WE COULD HEAR HIM CLRLY BUT HE COULD NOT HEAR US. WE DECIDED TO CONTACT FSS AND HAVE THEM CALL ATC AND GET OUR HOLD FOR RELEASE SO THAT THERE WAS NO CONFUSION. HAVING BOTH PLTS IN THE COCKPIT OR JUST CONTACTING FSS MIGHT HAVE PREVENTED THIS FROM HAPPENING.