In most cases the answer is: far enough. Not very specific we know, but there are a lot of factors to consider. Legislation in most countries means you cannot let a drone go beyond where you can see it, or about 500m, enough to cover a average field in the UK.
Of course terrain and field size do vary. Hills can block signal, and other countries have much larger fields. If Skippy looses a connection to your drone, it will return to its take-off location.
So where a longer range is needed, we recommend installing a longer range antenna on your drone controller, which will increase the range/penetration through hills etc. Contact us for more info