10 tips on improving wireless network :
1. Position your wireless router or wireless access point at the center.
2. Keep the router from the floor, walls and metal.

3. Replace the router antenna.

4. Change the wireless network adapter.

5. Add a wireless repeater.

6. Change the wireless channel.

7. Reduction of wireless interference.

8.  Updated firmware / drivers net.

9.  Use the device with the same brand.

10. 802.11b device upgrade to 802.11g devices.