Can a DIY WiFi Antenna Booster Improve Your Router's Signal?

A shaped metal reflector behind an existing antenna may alter its radiation pattern, but a casual foil shape has no guaranteed gain or coverage outcome. It also cannot amplify the router's output or create an antenna where none exists.

If the router has internal antennas, repositioning it in an open, central location is the safe first step. For a persistent weak area, add a compatible extender or wired access point rather than trying to attach an unsupported antenna.

It does not change the speed supplied by your provider. A reflector may affect signal direction in a particular setup, but its effect is not predictable enough to promise a speed improvement.

A passive reflector placed nearby is different from opening the router or modifying its radio. Keep materials clear of vents, do not disassemble equipment, and follow the router maker's instructions for any external antenna connection.