PLT OF M20 IS DISTR BY LOOSE KNEEBOARD BLOCKING ACCESS TO THE MANUAL RETRACTION LNDG GEAR LEVER. STRIKES GND WITH PROP; BOARDING STAIR AND LOWER ANTENNAS PRIOR TO REESTABLISHING CLB.

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SHORTLY AFTER LIFTOFF; ESTIMATED 25 FT ABOVE RWY; I ATTEMPTED TO RAISE THE GEAR USING THE MANUAL GEAR LEVER WHICH IS USED FOR THIS TYPE. AS I DID THIS; MY KNEEBOARD INADVERTENTLY FELL AND BECAME WEDGED IN THE SEAT WITH MY HAND BELOW IT. THE GEAR STARTED TO FALL BACK DOWN AND I INSTINCTIVELY LOWERED THE NOSE BUT TOO FAR. AS I WAS SOMEWHAT DISTR; I LOOKED UP AND NOTICED THE NOSE WAS LOWERED TOO FAR AND THE RWY WAS APCHING. I PULLED UP AND CONTINUED THE CLB. I REALIZED A MOMENT LATER THAT I THOUGHT I FELT A SLIGHT BUMP AND THOUGHT THERE MIGHT HAVE BEEN AN IMPACT. I ASKED MY WIFE WHETHER SHE HEARD SOMETHING (WE BOTH HAD NOISE CANCELING HEADSETS ON) AND SHE SAID SHE THOUGHT SHE HAD. THE TWR TOLD ME TO CONTACT DEP; BUT I TOLD THEM WE WANTED TO RETURN TO THE FIELD AS A PRECAUTION. WE WERE TOLD TO TURN R AND ENTER DOWNWIND AND ASKED WHETHER WE REQUIRED SPECIAL ASSISTANCE. STILL NOT BEING SURE THERE WAS AN IMPACT AND WITH THE ACFT RUNNING SMOOTH; I ADVISED NEGATIVE. WE LANDED WITHOUT INCIDENT AND TAXIED TO THE FBO WHERE WE DISCOVERED WE HAD STRUCK THE PROP; THE STEP TO THE ACFT; AND SOME ANTENNAS. MY DECISION TO CONTINUE THE CLBOUT WAS THE ONLY OPTION SINCE BY THE TIME I REALIZED SOMETHING MAY HAVE HAPPENED; IT WAS TOO LATE TO LOWER THE GEAR AND RETURN TO THE RWY. I BELIEVE IN THE FUTURE I WILL BE MORE COGNIZANT OF DISTRS DURING CLBOUT AND ALSO WAIT UNTIL HIGHER IN ALT UNTIL RAISING THE GEAR WHEN OBSTACLE CLRNC IS NOT A FACTOR.