As an owner of two TRX-1's , I agree with the above, but would add: Location, location, location. If you're lucky, your monitoring site (e.g., living room, den) could be in a "hot spot" of good reception. Wander out of that small square footage, though, and it's a crap shoot.
Reliable mobile monitoring of simulcast systems is, of course, virtually impossible. In and around town I have literally pulled over into selected parking lots where I have learned only from experience are hot spots to monitor interesting radio traffic. The city mainly consists of dead zones.
Important note: There is no good antenna fix for the simulcast distortion problem.