can somebody own a wavelength
I dont think so, not in the pubic ranges anyway. Only the media items being transfered over it should be considered 'property'. what ever it does take to run wireless, was stolen in this case
He is not stealing the router which provides the wireless or any users data, he is simply connecting via a publically available non-restricted network, in the public spectrum range without actually costing the owner of the installation any money (assuming the uk has moved out of the darkages and no longer has money-A-meg - if so then the ISPs should be more responsible and warn their customers otherwise that could be seen by some as negligence or profiteering, think of how pissed you would be with the bank for such negligence with security).