no model- looking for a new equipment to increase my wifi power to my netgear software on computer t

[paxton14]

I have an AT&T modem that send wifi signal to my netgear software on computer , but signal is weak- software and modem supplied by AT&T. I am on a U-verse line to modem. What can I use to increase signal power from modem to my computer?

[plemans]

Some details might help. 

1. what gateway is it from att? 

2. what wireless card are you using in your computer?

3. how far from the gateway is the computer?

4. what materials are in the way and how many? (how any walls and what are they made of)