wifi repeaters are simple.

- Step 1: Plug in power socket
- Step 2: Select network name.

You can also try to move the router to a more central location. My dad previously had a router in his garage and wanted to have other extensions installed to boost the wifi range. He then moved the router to his kitchen, which is central in his house, and now has signal in every room, and even gets two bars in his office room upstairs (which is just above his kitchen).

@tiger
SOLUTION 1 - ADD ANOTHER WIFI ROUTER
Simplest solution is to run an ethernet cable from your current wifi gig up the wall and along the ceiling line (or above the ceiling if you have a faux ceiling) and drop it down into the spare room. You can then either plug in directly or buy ANOTHER wifi router and plug into THAT router.

You'll need to run TWO wifi networks with different SSIDs. If you know what BRIDGE mode is, you can try to BRIDGE the second router so it looks like you only have ONE WIFI network - but that can be problematic should you need to reconfigure router #2 (you'll have to plug into it directly and maybe even software reset the thing).

OPTION 2 - REPOSITION YOUR CURRENT ROUTER
As an alternative - you can move your wifi router to a point that's somewhat midway between both signal points. That means getting a LONGER ethernet cable to connect to your ADSL modem. If you're using a service such as AIPU (ether to the home), plug that ethernet connector into the LAN/WAN UPLINK port of a cheapie switch (NOT a hub) and then run (up the wall and along the ceiling) the LONG ethernet cable to a point midway between points and attach your powered router at that point - hang it on the wall (high up so you don't bump into it).

This is less stressful and less expensive than doing the auxiliary router thing. You can purchase wall clips (either epoxy or screw-ins) to hold your cables in place so it looks somewhat professional.

When WIFI routers used to be USD 1k per POP (point of presence), I wired our old apartment with CAT5 pops in every room (except the kitchen, bathroom, & toilet) - all aggregated into a central 12-port switch (cheaper than USD 1k) and used to carry around a 2-3 meter CAT 5 cable and a cheapy 5 port switch or hub. I terminated each connection in one of the CATV outlet (each room was already wired for CATV). This system is actually somewhat more secure, as it's a wired network (although ADSL is notoriously unsecure...in case you're interested or worried about security).

FYI - although y'all may think putting a password on your wifi router makes your traffic secure, you're deluding yourselves. It's secure from your laptop/wifi device to the wifi router, then goes out essentially unencrypted into ADSL space unless you're using SSH, SSL, or an encrypted VPN.

Within most ADSL networks - you can typically see up to 250+ of your neighbors on the same network, not to mention many of the carriers/service provider's servers etc.

A simple check - connect your PC directly to your ADSL modem and dial in using PPP - then look at your network neighborhood.

Properly configured WIFI routers somewhat protect your home PCs etc from direct web-based attacks, but that's insufficient to protect you from a focused and committed hacker or hacker group.

Al

Adding an Ethernet switch is simpler than adding a second router if the final connection is going to be wired. It's the equivalent of adding a power bar when you want more power in another area. It's the same general principal but doesn't involve any wireless/router configuration on the second point.

@lautou

You can forget about fishtape. Have you ever seen how they run conduit where they ACTUALLY use conduit for wiring? It is a joke. There is no way you couls get a piece of thread back through it. In fact, the existing wire inside will fail soon enough from the damaged conduit.
I am building a house now, and the wiring and conduit is routed and installed exactly like I require. This means I am standing there watching everything, and after about the third time, they get it right. I am running over 1000 meters of data cable homerun through 3 floors to a server room, and it is a challange to get them to have a clue how to handle it.

You want to run wire? Only way is to make a brand new run outside or inside the wall depending on how much $$ you want to spend.