Personally, I'm going to go on record and saying I think this is a bad idea.
Also personally, I'm going to say that I sympathize, because there are a lot of radio stations/shows that I hate, and I do hate it when someone is playing a radio station so loud with no regard to the others who can hear it. I also happen to love quite a few radio station, and would be very upset if someone consistently messed with my listening of it, let alone made it impossible/impractical for me to listen to it.
OK, I know you didn't come here for a morality lecture so I'll try to keep my dissenting points focused:
- Everything I'm reading about this particular attempt seems to point to an attempt at reaching a long term solution through subterfuge.:
1. You want to force them to change it by making something assumed to be freely available to them "technically unavailable" to them.
2. You are trying to be discrete because you do not want to be caught.
3. "This is a very easy going workplace" leads me to believe that you feel OK because the consequences of getting caught are small (as opposed to its ok because such a technical solution is within your rights)
4. "Never blame me for it" tells me this is a key motivator for choosing this course of action (see pt. 2)
5. "Very unsavvy" leads me to believe that you want to perpetuate this situation by taking advantage of their lack of technical understanding, rather than through their consent.
Granted, if this were a war, I'd say these are all very good reasons to choose a particular course of action against an opponent. In a work place, however, where a degree of professionalism and personal integrity are expected components of the environment, I think you're burning your credit with an action like this, however clever and technically awesome it may be.
I'm not going to go so far as to say it'll make you a bad person, I don't know enough of you to make that judgement, but I think this is a poor way to go. And that's not even considering all the FCC regulations, laws and workplace rules about creating intentional interference, and other gotchas that could land you in actual hot water.
Honestly, if you're having trouble with this, instead of changing the radio station unilaterally, you need to raise the issue to HR, or management, and find an "in channel" way (scrum meeting, pow-wow, something) to find a solution all parties can (or at the very least, must) agree to. If this cant be done, then as much as you may like to work at that company, I'm going to say that you have a hostile work environment and need to find a way to relocate your position, or your career.