You can read all about it on-line but, basically, what you are proposing is illegal. Even if you hold a Flight R/T Licence it only entitles you to use the airband in the course of your flying. It doesn't matter if it is only a receiver and it doesn't matter what licence(s) you hold if you are not using the airband in the course of your duty.
However, there are many, many people who listen to the airband and although the authorities tend to turn a blind eye to such activities it is as well to know where you stand. A separate offence is talking about anything you may hear on the airband..
HTH