I'm a newbie so any assistance is appreciated. I'm trying to split a single line into two so I can watch one channel and record another. The equipment I've got is: Satellite WNC Model-AU9 with a single coax going to an HR20-700 receiver. I've tried both a Terk BMS-34 and an Antronix HS-3A but couldn't get either to work. Anyone know if this is possible and which splitter would work???