This article suggests placing a DECT phone mobile station at the bottom of the hive caused CCD.
DECT bases(the ones with phone jack at the back, not charging cradles) radiate 24/7, as long as power is plugged into them. All of them give off radiation at max power all the time, except for some Siemens Gigaset series. (To clarify, a home cordless phone is a DECT phone, so many people have one.)
The implications are big. If this is true, it means colonies close to a high strength cellular tower would be more likely to have CCD.
For those that move their bees from place to place: this would mean transporting bees while covered with RF shielding would keep them in better health because they would not be radiated by the hundreds of cell phone towers on the sides of the road. Shielding can be achieved with a reflective foil blanket, commonly called safety blanket for as little as $1-2.