[mothered]

maybe if you had someone drive you to the next city, drop you off a few miles from a train station, walk to the train station, take it to wherever you want to go, get off a few miles from that location and walk the rest of the way. wear a hoodie and dark sunglasses, find a remote location you can hide and use some pretty powerful antenna's to connect to your target. maybe then... maybe... you'd be pretty damn close to 100% anonymous and untraceable...

To a certain extent, you've just answered your own question.

However, wearing a hoodie and dark sunglasses only states the obvious. It looks more suspicious than anything else. So too Is a "remote location" - as a person who tries to hide, Is obviously hiding something. Wearing a suit and tie with a briefcase sitting outside a populated coffee shop during business hours with a laptop, will seem like you're performing work-related duties, hence no suspicion Is raised. Traveling to the location (to perform the attack) via public transport and connecting to an "open wireless network" with everything I've already stated, will definitely be untraceable.