To do it, log into the DD-WRT Control Panel and select Wireless --> Advanced Settings. Scroll down to Xmit Power, as shown on the screen.In Linksys, the default is 28 milliwatts. You can crank it up well beyond that; the range you can use with DD-WRT is between 0 and 251 mW. But don't crank it up all the way, or even close to all the way. If you do, you could quickly burn out your router, because the higher the milliwatt rating you use, the more heat your radio chip set will generate, and you could quickly brick your router.

The DD-WRT documentation says that using up to 70 mW should be safe in most cases. You may want to start lower than that, and keep increasing it until you find that the wireless signal is strong throughout your house. Click Save Settings every time you make a change.

Step 6: Improve network performance
Several other settings on the Advanced Settings tab may help improve the performance of your wireless network. Changing the Beacon Interval setting can help if wireless clients are getting poor performance. The beacon is a wireless packet the router sends out as a way to synchronize the network. The default setting is 100 milliseconds. Change it to 50 milliseconds if you have wireless clients with poor reception.

If you have a network with from only one to three wireless PCs on it, you can also improve performance by allowing Frame Burst. This enables packet bursting, which can increase overall network speed. But if you have more than three clients, you can actually decrease throughput by doing this. By default it's turned off; select Enable if you want it on. When you're done, click Save Settings.

Step 7: Improve security by auto-turning off wireless signals
When you're not at home or when you're sleeping, you most likely don't turn off your wireless network. If you're worried that bandwidth vampires or network crackers will steal your bandwidth or break into your network when you're not around, you can schedule your router to stop transmitting at certain times of the day and night. Wired connections will still work, but wireless connections won't.

On the Advanced Settings screen, scroll down to Radio Time Restrictions and click Enable. A timeline of all the hours in the day will appear. Click on all the hours that you want wireless access disabled. That hour will show up red, as you can see in the nearby figure. When you're done, click Save Settings.