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Originally Posted by wallcraft

I agree that the Fire's WiFi is relatively weak, so your only option is to improve the WiFi signal. There are several ways to do this

1. Move your WiFi router
2. Change to a different channel
3. Add a better antenna to the router
4. Add a WiFi booster
5. Add a WiFi repeater
6. Add a 2nd WiFi router

These are listed in order of complexity and/or cost. You could also replace your existing router with a more powerful one, but I don't know what to recommend.

See How Can the Range of a Wi-Fi Network Be Boosted?

Thank you for the suggestions, wallcraft. I'll try them. While I don't feel we should have to buy new devices to get a better signal when my other devices work fine outside, I may just end up doing it as a last resort anyway. I'd really like to be able to use my fire with the net outside in my yard. If the first options don't work, I'll try a new antenna first, then a booster. I'll get a stronger router if I have to, but I'd really rather not.