Video monitor(s) for 3 kids?

hgrogers

I had the Summer video monitor for older DD & loved it, and got it again for twins with extra camera. But the Summer monitor didn't work for us with 3 cameras - there was interference. Summer told me their system only works with two frequencies (same thing happened with my friend with triplets). So now I am using the Summer monitor with extra camera in my twins' room, and older DD does not have a video monitor - and I don't like it! 

Anyone else encounter this problem?  Does anyone have  3 Summer video monitor cameras working successfully in their house on the same floor? If not, is there another video monitor that would work in DD's room, that would somehow not interfere with the two Summer cameras in the twins' room?

 TIA

TIA