This is a trivial matter. The antenna (or cable cable) connects to the RF
intput, the RF output goes to the TV's RF jack. Simple. (I can't believe
you're having trouble with something so simple.)

The VCR shoulid have a switch that lets you choose between the antenna
signal and the VCR signal. That's it. If you can't view other channels while
recording, you're doing something wrong. And it's something very simple
"wrong".