This bandwidth, however, is not realistic for PAN, because as the frequency increases, the body begins to exhibit antenna-like properties and radiate, which is in direct conflict with the goal of PAN. In practice, the bandwidth is limited by a filter on the front end of the receiver which is typically a few kilohertz.
In practice, the bandwidth could likely be usefully pushed up into the tens or perhaps hundreds of kilohertz. Above that, pickup of high frequency interference is likely to become a serious problem as well as the problem of the body behaving as an antenna.