The other problem in the UK (and the USA too) is trying to comply with OFCOM RF exposure limits, which is especially problematic with efficient tuned loop antennas.
Folks usually can get away with home built, or even commercial designs, because they have so many lossy parts or don't have a very high power rating so they don't pose much of a risk.
However, once you start to use a properly engineered and efficient loop, things can become quite dangerous.
In this case I'd agree that it's definitely worthwhile considering a calculation of the exposure limits and suitable safety zone distances from the antenna when it is in use.
Regards,
Martin
