The MRF250 and to a lesser extent the 260 are known to have interference issues. The MRF350 is the base station of choice for most installers because you can move the antenna away from the interference. I never use the 260. Also note the MRF250 used emitters with 2.5mm plugs. The 260 and 350 use 3.5mm plugs, so you will have to change your emitters.