If Adam's suggestion does not pan out, you can buy a universal remote that outputs RF only.  That assumes a blaster/receiver with an emitter stuck to one of the TV's IR sensor.  I do not have a suggestion for you on which to buy.  My own is the RFS200 package ($76 atm) but the problem there is that it outputs both RF and IR simultaneously.  
If you can afford that, and find that you can't afford an RF-only-capable remote for some reason, then you can cover the remote's emitter with something thick, I dunno, duct tape perhaps?  This method requires use of at least two remotes.  Otherwise, with an RF-only-capable remote, you might perhaps be able to control one macro (first TV) with IR functions programmed, and the other macro (second TV) with RF only for example.