Hey OM:
A 3:1 mismatch you only lose 25% of the power. And that's power not
voltage. So with 50 to 75 ohms you are not going to lose much. And you
need plenty of signal so there won't be any pixelization. And if you
don't use a balun at all: you have the shield of your coax as an
antenna too. I say connect direct and forget about it.

There's only 2 possibles; either you don't get enough signal or you
do. Those are better odds than the lottery.

73 OM
de n8zu