Distance controllers - sensors

Hi,

I´m a developer trying to create a training app but i need to use one of the controllers, not as a hand but as an object quite separated from the sensors in the helmet. I´ve tried to set a wide boundary room but only managed to separate the control about a 60 inches form the sensors, then it freezes so it seems not to  be working. Is there any way to increase that distance without the sensors stop working or there is a limit?

thanks a lot

Alex