David's landlady has wifi but she doesn't want to improve the signal so he can get a better connection. Leo says you can get a WiFi antenna to improve your signal,but if you can convince your landlady to put the access point in a better location, that would be the ticket. Check out RadioLabs.com for tips on which directional antenna to buy to get a better signal. You could also offer to buy her a newer 802.11 AC router. Leo likes the Asus C3200. It goes a long way.
Naomi has a friend who can't seem to get Internet access with her mobile phone. Leo says if she doesn't have good cell access in her home, then she should ask her carrier for a Femtocel that she can connect to. It basically uses the internet to make phone calls. But she'll have to have a separate internet connection to take advantage of it.
Another option is a signal amplifier. Naomi can check out WilsonAmplifiers.com for the WeBoost. It'll boost her cell signal from where it's best to where it's worst.