With the greatest of respect, the Office of Communications is "interpreting" the Act, they are not the final arbiter, the courts are.
Go ahead and give your girlfriend your scanner or transciever to listen in on. There should be no problem. You make "broadcast" calls don't you? By definition they may be listened to by people "intended" to receive them. I would have thought that included your girlfriend, volunteer marshalls at a fly in, skydivers and all sorts of people.
The real test is intent to use the information for an unlawful purpose.
Telling your girlfriend to remove bra and knickers over the radio is not a hanging offence, unless she is under eighteen or whatever.