I have the same set up in my sarry, it all seems to work fine. I can't resolve your problem, but if you need photo's of my set up, i can do that at least.
She was out all day Saturday chatting to a 434 and a 436 happily over the 353's
we started off the day around 50,000mhz but moving around town picked up interference in built up areas which seemed to clear up when we dropped to 35,000
is there a household appliance that would cause that ?
If some pics would help let me know