RV8 pilot reported a NMAC during takeoff with a helicopter taxiing on the adjacent parallel taxiway. A previous garbled CTAF transmission led to a lack of awareness of the helicopter traffic and indicated no need for action to avoid the helicopter.

Narrative

As I completed pre-takeoff run-up at an uncontrolled airport (ZZZ) I received partial radio transmission from an aircraft taxiing toward the FBO ramp and fuel services. Although I did not see the aircraft in question; that location on the field did not seem to be a conflict for me as I did a visual check for traffic on final and announced my intention to depart Runway XX. As I became airborne I saw that there was indeed an aircraft taxiing as described - and it was a helicopter - as had likely been stated in the part of the transmission I had not received. There was no need for either of us to take evasive action and not doing so was the safest course of action at that point as we were not in conflict with each other - my aircraft over the runway center-line and the helicopter moving over the parallel taxiway. However; at point of closest approach we were closer than any two airborne aircraft have any business being. My approach henceforth will be to make sure that I don't make decisions based on partially received transmissions. Had I heard the word 'helicopter' anywhere in the announcement of the taxi activity I would have delayed my takeoff until the helicopter was firmly and visibly on the ground!