Certain things can block your Wi-Fi signal:
- baby monitors
- bodies of water
- base stations of cordless phones
- Bluetooth devices
- brick or marble internal walls
- copper plumbing
- hot water systems
- Place your modem in a central location in your home.
- Use Telstra's Home Dashboard, a WI-FI speed test app which you can download via the iTunesTM App Store or Google PlayTM store.