Anyone know if it is feasible to split the antenna lead of most automotive radio antennas? More importantly, are there ready-made adapters to accomplish such a task?

The vehicle in question is a GM product, and is fairly straightforward. It isn't an exotic with diversity tuning, etc.

I ask because I want to use the Empeg tuner in conjunction with another head unit that offers advanced capabilities (recording off the air, etc.)

Links to such a product (if it exists) are GREATLY appreciated!

Many Thanks!

Rob