Honey bees travel up to a mile from the hive, quite a distance for a small animal.
Scale equivalent to 80? miles for a human. They know where they are and where the hive is, because they have a built in 'magnetic compass'. Coupled to this, they also know the time of day using polarised daylight, so can compute lattitude and longitude. Nearer the hive they have to use sight to locate the exact entry point of course. Mobile phone masts do give out radio waves that bees can detect and which may possibly impare their homing abilitiies. Many beekeepers say populations in hives do suffer near masts. On the other hand, as long as the mast gives out a constant signal, a fresh bunch of new bees would still have a fixed reference, provided the signals caused no other physiological damage. Bees only forage for about 3 weeks in summer before their wings wear out.
The veroa mite is indeed a serious bee pest world wide. As the climate is warming, we are also getting here giant bee-hunting wasps coming up from southern France and Italy. Great!
Alan