100 meter distance of router and cp has no signal

Bad router or it may be the wifi card in your device? I have a router that the wife's laptop cannot connect to very welll from 18 metres away. The guy down the road can logon to my network from 40 meters distance.
Maybe it is not the router.
Try replacing it with a newer model, the lifespan of a router is probably about 2-3 years before they start degrading. Check reviews for recommendations as to which has the best signal strength/range

The strength of the signal is proportional to the SQUARE of the distance, e.g., 1 foot == 100%, 2 feet == 25%, 5 feet == 4%.

Move the router and the computer closer together, with fewer signal-blocking walls between the two devices.

Move the router onto the same floor (basement, main, upper) as the device.

The maximum length of LAN cable you can use is 100 meters (328 ft. For greater lengths you need a repeater.
Fordetails and specs, go to this WEB site.
http://en.wikipedia.org/wiki/Category_5_cable

I weak wireless signal can be caused by several things including distance from the wireless router. Click on this link to see if you can resolve any of these issues to improve your reception.
http://www.fixya.com/support/r9400992-things_affect_wireless_router_signals

Wireless-g router can only extend it's wireless signal up to 50 to 75 feet. You can use a wireless signal extender to be able to extend the signal further. And yes, you may have password on the wireless network.

Coverage
We tested the router’s coverage at different distances and with different obstacles. We measured the signal level in five points:
Point 1: Near the WRT300N
Point 2: At a distance of 4 meters without obstacles
Point 3: At a distance of 5 meters + two thin gypsum wallboards
Point 4: At a distance of 6 meters + one brick wall, about 30cm thick
Point 5: At a distance of 17 meters + one thin gypsum wallboard and one 30cm brick wall
Here are the results...

The connection between modem and switch is Ethernet, so the official maximum distance is 100 meters. It's unlikely that using any shorter distances will make any difference, so the ideal is anything up to 100 meters.

Where to start..
First - 100 (130) ft is a distance that is not out of reach. Colleges are using professional access points, but I assume you are not willing to pay 600$ for that.

Make a survey: What can cause problems? Sheds often are filled with (or made out of) metal - bad for wireless. Glass is an excellent reflector but very difficult to penetrate. Are you using any other devices that work in the 2.4 GHz range like microwave, cordless phones etc? Try to get them out of the way.
I use a program called "Netstumbler" (download link) and walk around with my laptop to find strong/weak signals and to see if anyone else is using the same chanel (1,5,6,11). If so, try to use one as far away as possible. (See here.) Don''t forget that only channels 1 through 11 are legal in the US!

The output on a store-bought router is usually 42mW. You can increase that value by using a third-party firmware like dd-wrt, hyper-wrt etc., but I don't believe your model is supported. (The old Linksys routers are the ones that can run almost everything like WRT54G/WRT54GS - you can get them used for 20-30$ - I use two of those and they work fine).

The antenna you have is a omnidirectional antenna. This means it is sending the signal in all directions and that is the reason why they tell you to put the router in the middle of the house. You can try something simple like this to direct your signal.

Also - make sure that you have the latest firmware installed on your router (check here).

Last - inspite of the problems with wireless signals in general - why don't you just run an Ethernet cable over to the shed? Maximum distance is 100 meters (300ft) and you would not have to deal with interferences, bad weather, neighbors sending on the same channel...

If you have any more questions, just come back here and leave a comment - I'm happy to help.

- Check the toggle switch of your computer make sure that it is Enable
- Check if you have 3rd party software that is installed to the computer, that can use to connect wirelessly.
- Check the distance between your router and computer (100 meters is the maximum distance)

For problem number 1, your linksys home router has a maximum signal range of 100 to 150 feet, that is less than 50 m. The reason for the poor connection is the distance between the laptops and the wireless device. Try moving the router closer to the center point from where both laptops are stationed. If you can make the maximum distance between 30 and 40 meters (shorter the distance the better the connection strength) from the router to both laptops this may solve the first problem. If you cannot change the location of the router, then you may want to consider switching to a wired connection for the laptop you are trying to review from, (the maximum distance for cat 5e ethernet cable is 100 m).

For problem number 2, I am unsure what you mean by system does not work, do you mean your laptops will not turn on, or that you cannot pick up a signal from the wireless device?