ahh, u can't merinade backstrap, it's the 2nd best piece on the deer.
I take a blend of spices and mix them together into a dry rub,
rub it on the strap.
take a pack of thin bacon (i find hickory is too strong) and lay it out onto the counter the length of the strap
set the strap onto the centor of the bacon and roll the bacon around the strap and toothpick it on (like bacon wrapped scallops)
slice the strap into pieces inbetween each slice of backon and place on your grill, grill untill the bacon is done and the strap is cooked to your likeings