Brian Dorey noticed that there were three unpopulated pads on the Pi Zero W near the zero-ohm resistor and realised what it was for – to place a U.FL RF connector. This connector allows you to add an external antenna to the Zero W and increase its wireless range. By moving the resistor so that it connects to the pads, it disconnects the internal antenna and allows you to add your own. He’s written the modification up on his blog and you can read that here. Obviously, doing this will void your warranty and will make it hard to reverse the action, but as long as you’re aware of that, that’s fine!