GPS is a high frequency operation. the higher the frequency, the shorter the antenna. the antenna is ther for a reason.
wut the guy probably meant by "amplifying" was to match the impedances. you may be right, that you could get better reception w/ a longer antenna (im not sure of the frequency of GPS, and therefore how long an ideal antenna would be) but it would be pretty hard for you to re-match the impedances.
The signal level received from a GPS satellite is around -126dBm at 1575 MHz for a good signal. Many GPS antenna's will have a pre-amp in it to amplify the signal before more noise gets picked up in the cable from the antenna to the receiver.
Can i make my own antenna for a GPS receiver that is more suitable for my project?
You can try. **broken link removed**
Notice that the size is already much bigger than the commercial units using ceramic for the dielectric. This person attempted to get a smaller size by using air as a insulator between the two layers. The connection point of the coax is also very critical to get the correct impedance match.
I don't really need to get the antenna smaller. But the problem with it is that it requires quite much "free sight" to the sky. I don't know, maybe all GPS are the same. It does not work indoors. Not even inside(beside) the window. I have to be outside to use it. Is this common for all GPS receivers. Would it be possible to change this whith a better antenna?
As you can see, i am very new to GPS receivers :wink:
And by the way. How many sats is recomended to get a rather acurate result? I had 5-6 when i tested it today in the car with the antenna by the front window.