It depends on the advertising in question. I'll wear a ball cap that advertises my range. It's understated, though, so likely not noticed much. Much more "advertising" is the fact that I do speak up on gun issues and have lobbied the state legislature and Congress, including testifying before the former. I'm not ashamed that I carry, but by the same token, I'm not going to OC either, unless I have a good reason to do so. (I'll still lobby for those who choose to do so, however.)
Is that advertising? You tell me.
Blessings,
B