I have little or no signal strength - LG Prada KE850 Cellular Phone

Try checking the signal strength then run the scan again.
Checking the DTV signal strength
You can check the DTV signal strength to determine if you need to adjust your antenna or digital cable input. The higher the signal strength, the less likely you are to experience picture degradation.To check the DTV signal strength:
1.Press MENU. The on-screen menu opens.

2.Press < or > to highlight Channel, then press v. The Channel menu opens. The DTV signal strength is shown at the bottom of the menu.

3.Press EXIT to close the menu.

You can try this solution

1. Right-click on the 'My Computer' icon on your computer and choose 'Properties'.
2. Click on the 'Hardware' tab and then click on the 'Device Manager'.
3. Now, find the 'Network Adapters' section and click on the little plus-sign to the left.
4. Find your wireless network adapter and right-click on it and choose 'Properties'.
5. This is where things will get different depending on the brand of your laptop and wireless card and which drivers you have installed. Browse through the different tabs and look for settings such as 'Power Management' or 'Transmit Power'. Adjust the settings to either disable the power management or increase the amount of power used by the network card.
6. Now, test your wireless signal strength to see if you still have the same weak wireless signal you had before. The chances are that you will notice an increased wireless signal strength.

AirPort signal strength is directly affected by things like concrete walls and metal ducting. You might want to change the physical location of the Airport to help with signal strength. Placing your Airport router in a central location based on computer usage location will help a lot.
Also changing your routers wireless channel thru Airport Utility can help. Think of it as a lot of people using the same street, it tends to get a little crowded. So changing the street means less traffic.

80% is a good signal strength....but if you want to increase the signal strength, then you need to move the wireless router to a very ventilated area, also the router should be placed atleast 5 feet away from other electronic devices like, modem, ups, microwave ovens,refrigerators etc.... also there should be a line of sight between the router and the wi-fi adapter... but in order to connect to a wireless network 25% of signal strength is enough....

Generally means you do not have enough signal strength, on that particular frequency? Check all antenna connections, make sure they are all tight, it only takes a little problem to kill a signal..down to the point where it will not "Latch" on to it correctly.

The receive indicator tells you the strength of the signal when the timing signal was transmitted, (this occurs only during the night).

The strength of the signal dictates how much of the indicator is shown i.e. full strength, full picture, half strength, half picture, no picture, no signal.

Signal strength seems to vary with location (how far you are from the transmitter), so perhaps you are in a poor reception area.

MBps or megabytes per second, is your data transfer rate. This varies on signal strength, quality, interferences, etc. If you can get a little closer, great if not, try to get metal obstacles out of your way to get a little better signal. Wireless ethernet is transferred via radio waves, often metal objects can obscure the signal strength. Also try moving the antenna to a horizontal position this sometimes helps.

could be a worn rf modulator
this controls the radio frequencies.
If you are having trouble with dropping calls that last for a little longer than normal 1-2 mins then that would be my guess

have a go at changing the wireless channel within your router there may be some interfearence generated by your pc that is affecting its signal strength