Hi, i have a question. is a 3 antenna router with 2 dbi which one better than 1 antenna router with 2 dbi? for example, if my room is 40 feet from the 3 antenna router and 40 feet from the 1 antenna router the receive signal from 3 antenna router would be better than one antenna router?

The reason your laptop may have trouble connecting at full speed could be due to the quality of its wireless card/motherboard (if built in). There are a few things you can try, first you can try updating the drivers for your wireless card/motherboard via windows update or alternatively from the laptop manufactures website. You will need to make a note of your make and model number of your laptop which is normally on a sticker underneath the laptop. This may improve things as there have been some minor signal issues addressed with driver updates on some wireless card.

Other options:

check if your router has detachable aerials (if they can be unscrewed) if they can you could buy some aerials with a higher dbi. Routers typically ship with 1-3 dbi aerials you can get them typically as high as 8dbi for indoor use, this will improve the signal slightly. If your router has more than one aerial you should replace each of them with the same type and dbi to ensure it works correctly.

buy a usb wireless adapter, these give you access to wireless if you don't have any built in, but can also be used as replacements for your in built wireless.

change your router (a last resort) but there are a number of advantages to this, newer routers a more powerful, faster and use "N" which is faster than G. N gives you speeds of 125mbps upwards. Wireless N routers are backward compatible for B and G devices so any older devices will work but they will still be subject to any limitations of wireless B or G.

What makes you think you need an antenna with 20 dB of gain to get 300m with 2.4GHz?
If that's an RP-SMA connector on the card, try an (8 dBi) RE09P-RSP from l-com.com (about $40).

2 4 GHz 8 dBi Flat Patch Antenna 4ft RP SMA Plug Connector RE09P RSP

Hi - Wifi devices are very low power. Under optimal conditions, they can transmit up to 100 yards. Optimal conditions are basically an unobstructed "line of sight".

The number of and the more substantial the obstruction, they greater the impact is on the signal. An example is the devices (computer and the router) are separated by 40 feet and a single Sheet Rock or gypsum board and wooden wall; like you might find when a computer is being used in the back yard and the router is inside the house in a room next to the back yard. The signal should be relatively strong over this distance and this minimal obstruction material. Compare this to the same distance of 40 feet, but the wall is now brick or concrete, and there is a second wall like the first example - but it has a coating of aluminum; and there is a wooden floor; all between the computer and the router. That is an example is what you might find if the router were in a second floor room at a neighbor's house that has aluminum siding and the computer is in a basement of your house. The signal may be so degraded by aluminum, wood, concrete, soil and gypsum obstructions that the speed is very slow or isn't usable at all.

Now you've got an idea as to how the materials of the obstructions can wreak havoc on a wifi signal. There are also issues of interference. Most wifi "b", "g" and "n" signals operate on 2.4Ghz and and 5Ghz frequencies. These same frequencies are employed by other low power / unlicensed consumer devices - most notable are cordless telephones (not cell phones), microwave ovens, Bluetooth devices and baby monitors. If enough of these devices are in the area or between the router and computer, they can disrupt the signal significantly as well.

So, if the space between the computer and router are close, but you're still having trouble - look for these popular consumer devices. Unplug them / remove batteries and see if the signal improves. Move the router to a centrally located point in the area that it is to be served. Pay attention to the types of materials that the signal must pass through - air, paper, and wood aren't too bad. Brick, mortar, soil & metal can substantially reduce signals very quickly. It is better to have the router above the area to be served rather than below it.

Lastly, check the channel that the router is being operated on. The band of frequencies for "b" and "g" wifi consists of 11 channels (1 through 11) in the U.S. The best frequency to use is channel 5 (ch 5) or channel 6 (ch 6). This is because it is in the "middle" of the band (like the way 98 is middle of the 88 - 108 FM broadcast band). Other signals *may* be on the frequencies above ch 11 and below ch 1. Being on 5 or 6 keeps as much space between YOUR wifi signals and those that aren't wifi types. Ch 5 or Ch 6 may already be in use by a neighbor. If that is the case, you both will be on the same channel and the signal will be significantly reduced. Try to get as far away from his or her signal as possible - this may mean ch 3 or ch 9 - or maybe even ch 1 or ch 11 under the right conditions.

I hope this helps and good luck! Please rate my reply. Thank you.

What power supply are you using? if it is a 1.4 amp then it may be too low. See if you can find one that is about 2.6 amps.

I think the best solution is to buy a new antenna with more gain ( 12dBi )

Either look into getting bigger (higher gain) antennas for your router, or get bigger/stronger antennas for your PC's.

Other than repositioning the existing antennas or putting the router higher up in the air, there isn't much you can do.

Here is the Solution:

1. Convert 15 ft into yards. 1 yard = 3 feet
=> 15 ft = 5 yd

2. Find the area of the given room. The cost for given room is given, and cost for carpeting 1 sq. yd is given. So,
800/20 = 40 {i.e. 40 sq. yd (area of the given room)}

3. Now, Length * Width = Area
=> x * 5 = 40 [Taking Length = x yd]
=> x = 40/5
=> x = 8 yd
=> x = 8 * 3 ft
=> x = 24 ft

So, Length of the given room is 24 ft (8yd).

I hope this solved your problem (in time).

N is the way to go, then it depends what extra features you need...here is a good all-around wireless router http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4629787&CatId=2668
Repost here if you have more questions..
Regards

3 audio inputs (3 analog, 3 coaxial digital, 1 optical digital)

2 video pass-through inputs (composite and S-video)

Video output for TV (composite, S-video, and component)

Media center • 3 1/4"H x 13 3/4"W x 10"D • (8.3 x 34.9 x 25.4 cm) • 6.7 lbs. (3 kg)

Remote control • 1 1/8"H x 2 1/2"W x 9"D • (3 x 6.5 x 22.9 cm)

Gemstone speakers • 2 1/2"H x 5 1/2"W x 4 1/8"D • (6.4 x 14 x 10.5 cm) • 1 lb. (.45 kg) each

Acoustimass module • 14 1/2"H x 8 3/4"W x 19 1/8"D • (36.7 x 22.2 x 48.5 cm) • 23.3 lbs. (10.6 kg)

Total shipping weight • 44 lbs. (20 kg)

What's In the Box • Acoustimass® module • Media center • 2 speakers • 3·2·1 universal remote control • Setup DVD • Antenna stand • Stereo cable • Video cable • Speaker cable • Module cable • Rubber feet for Acoustimass® module • Rubber feet for speakers • Batteries • AM antenna • FM antenna • 120V power cord • Quick setup guidepls rate !!!!!!

There are a couple more questions

1. Is it a removable antenna on the wireless router e.g. 5db or 7db gain. you could just get better antennas to increase signal strength for distance.
2. E-bay has a linear antenna you assemble with a usb wireless network adapter attached.