I have been using the Bullseye Camera System for a while now. It's very nice to not always have to drag heavy steel targets out to typical long range distances,
The Ammo Can Edition was designed specifically for tablets and phones which have weaker internal antennas than laptops. The Ammo Can Long Range Edition includes the Base Station Receiver/Signal Extender which stays by the shooter to catch the signal from the camera and broadcast it to your tablet or phone. It works great with a laptop too. The fact that the system is built into the ammo can makes it nice and portable and simple and also weather proof.