I put one on the center pole at a Chick-Fil-A display that I did... didn't seem to have any issues.
Just yesterday, the current in my AC power line caused all my lights to flicker wildly (they were getting data wirelessly on the 2.4G band). So it can happen. I would just verify your reception: a) with the tree off, b) with it all white, and c) with the most animated effect you can think of. And if your light controller is also under the tree, don't have it sending/receiving any data wirelessly--that's just asking for trouble.
Inside... since this was mostly for the drive-thru and parking lot area I was only using the antenna that came with the transmitter, not a diapole antenna.