I use the R114f and many other people use it.
i have 2 as they are so good and i highly recomend them!
i have never had interfirence in the 2 years of owning it and it also has a built in fail safe. just dont be daft and cut the areil. loop it and but it in a sutible places eg the back of the ant . withoug case (how i use it) it weighs about 6-7g the xtals weight abotu 1g max so now probs there.

good luck