with regards to the OP:
wireless bonuses need to be worth taking, or else there's precious little for combat-hacking to DO. Consider how unfun it'd be to play a mage if NPCs could just go "astral off" and be untouchable by magic!
I would have liked to have seen "wireless-off" just not even being a thing anymore. But, whatevs. It's probably for the best (of non-hackers, anyway) that you have the choice: use those sweet sweet bonus dice/action rebates and be at risk of getting hacked, or turn them down in order to be unhackable.
And ditto Michael Chandra's comment about spotting a matrix icon as not being the same thing as spotting a hiding person. Think of it like spotting magic: just because someone might feel some heebie-jeebies and realize some active magic is afoot, it doesn't ALSO mean that that someone knows the active magic is invisibility and it absolutely doesn't mean he knows exactly where the invisible object IS. Yes, your chameleon suit can be tracked to a specific location, but not until a Trace Icon action has been successfully done. If you think that's a risk then absolutely don't use your wireless bonus. If you don't think the opposition is paying that close attention to the matrix airwaves, or if you trust the competence of your matrix overwatch PC, then by all means take your chances.