I have a EX1/Sennheiser G2 setup. The transmission range is really good…500 feet at least. I haven’t run into many issues with either the clip on transmitter or the plug-in transmitter.
With any wireless gear you don’t want to have the attenaes closer than I think 3 or 4 feet…it says something in the manual.
What frequency range is your gear in?
You also need to use Sennheiser’s website and see if you aren’t interferring with any radio/TV frequencies. All cities have different setups so you need to get this info before your shoot.
https://12.148.18.149/ is the Sennheiser site.
During one event I kept getting static. Even though my cell phone’s frequency isn’t near my wireless gear’s range, I turned it off. For the rest of the event, no more interference. Coincidence?
Also…always use fresh batteries. This can’t be said enough.