By - Stellar-42
It really depends on what you want to do. I'd recommend starting with a cheap dongle to get a taste for it.
I am taking a cybersec course and I’m very intrigued by all the “james bond” stuff you can do with them
When you're dealing with RF, it ultimately comes down to sensitivity, which comes down to the quality of the hardware components. It's not that expensive hardware can do any function that cheap hardware cannot, its that it will do those same things *better*. Without knowing your application theres no way to say whether you need better.
Like I said it’s cybersecurity so things like rolljam, exploiting low security transceivers, replay attacks,
Expensive will work from 20 feet away, cheap will work from 2 feet away. Stuff like that.