I want to share the wireless connection with my neighbor. However, the signal can reach only his front door. Is there a way that he can buy some signal boosting device that can be put on his front door so that the signal can be good entire his house? Can someone give me a link to those type of device?

I don't want to upgrade my router since I want him to buy his own device if he want to use my connection.

Well you could use a WiFi repeater, which receives the WiFi signal and then retransmits it. This would be the most expensive option, but probably the most effective in your situation.

You could also just use better antennas. For best results you would want to use direction antennas, but the problem there is that this would prevent you from using WiFi effectively in your own home, all of the signal would be getting directed into the direction of your neighbors house, and not covering your own home. You could get upgraded omnidirection antennas, but these will not get you the same range as a directional setup.

How far exactly are we talking about between your router and the device he is trying to connect to it?

I read on the website and looks like we can use LinkSys router as a repeater. Can someone confirm if I understand it correctly? If so, I can ask my neighbor to buy that router and follow the instruction from the web.

http://www.dd-wrt.com/wiki/index.php...eless_Repeater

If it's possible, try relocating your router and/or your neighbor's computer. The physical location of each device can make a big difference, even within the house.

It's easy enough to make your own antenna with minimal expense and very good results. USB adaptors & DIY antenna = "Poor Man's WiFi" ?

You should get a very significant gain (the article quotes 12 -15 db).

You can also build an effective antenna with a tin can How To Build A Tin Can Waveguide WiFi Antenna . This is more directional than the wok antenna.

edit: probably the easiest solution to this problem is to replace your router's antenna with something like this: SAFECOM 5dBI 2.4GHz Omni-Directional Antenna

I bought something similar (I think I have the 9dBI version) and it made all the difference between no signal through several very thick stone walls and having a good strong signal. A big plus is that these antennas are very very cheap!

Here's what I tried:

http://www.freeantennas.com/projects/template/

(see other stuff on freeantennas.com and elsewhere)

The two antennae on my Linksys WRT-54GL are 6 inches apart. I cut two pieces of sheet metal 5.5 inches square. I wrapped 10-inch wire ties around the two metal squares so they'd stay curved VERY close to the exact curve in the template (you can glue aluminum foil on bent cardboard instead of using sheet metal). Position your parabola (or both of them) as precisely as you can over your router's "rubber ducky" (or "duckies") and see what happens.

There is some improvement in the direction the parabolas face, but the signal is not "used up". It still puts out a good omnidirectional signal. So you can probably use the Net at the same time as your neighbor.

I was surprised at how easy this was. Combine this simple antenna with re-orienting the equipment at both ends.

You may find some detachable 5-inch omni antennas out there, with a couple of feet of wire and a 1 inch base. Give one to your neighbor and tell him to put it on his window-sill. Then he doesn't have to move his tower PC into an odd/difficult position in his front room. For $7 or so it's worth buying one to experiment (disregard this if he has a laptop).

Let us know how it works out!