GEAR OF GA SMA HIT A POWER LINE DURING INITIAL CLIMB OUT OF PRIVATE ARPT NEAR CAD MI.

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THIS INCIDENT OCCURRED ON TKOF FROM A 2300' PRIVATE SOD AIRSTRIP NEAR CADILLAC; MI. THE ACFT WAS LIGHTLY LOADED AT THE TIME WITH ONLY MYSELF AND TWO CHILDREN ON BOARD AS PAXS AND WITH APPROX 35 GALLONS OF FUEL IN THE FUEL TANKS. THE ACFT TYPE IS AN SMA. I MONITORED THE INCREASE IN MY AIR SPD AS I ROLLED DOWN THE RWY FOR TKOF. AS I REACHED THE POINT WHERE I HAD CALCULATED I WOULD HAVE TO MAKE A GO/NO GO DECISION; I CONCLUDED THAT THE AIR SPD WAS INCREASING SATISFACTORY TO CONTINUE THE TKOF. HOWEVER; AFTER I PASSED THAT DECISION POINT; THE ACFT PASSED THROUGH A SOFT AREA ON THE SOD RWY. AT THAT INSTANT I HAD TO MAKE A DECISION WHETHER TO CONTINUE OR ABORT THE TKOF. SINCE I COULD SEE THAT I WOULD NOT BE ABLE TO STOP THE AIRPLANE BEFORE THE END OF THE RWY AND THAT A CRASH OFF THE END OF THE RWY WOULD BE VIRTUALLY CERTAIN IF I ABORTED THE TKOF; I DECIDED TO CONTINUE WITH THE TKOF. AFTER THE AIRPLANE BECAME AIRBORNE; I TRIED TO OBTAIN SUFFICIENT AIR SPD FOR THE CLB; BUT WAS UNABLE TO CLR THE PWR LINES AT THE END OF THE RWY. THE R MAIN LNDG GEAR STRUCK THE UPPERMOST PWRLINE AND BROKE THAT CABLE. THIS CABLE STRIKE DID NOT SEEM TO SIGNIFICANTLY SLOW THE ACFT ANY FURTHER; AND I CONTINUED MY CLB AFTER OBTAINING NORMAL CLB SPD. LATER INSPECTION OF THE ACFT SHOWED THAT THERE WAS NO DAMAGE DONE TO THE ACFT ITSELF OTHER THAN SOME MINOR SCRATCHES ON THE LNDG GEAR.