Hi!
Perhaps you are looking for something like this:
http://www.flygradar.nu/?language=en
This is a service developed by some Swedish aviation fans. That's why the service is originally in Swedish language.
Their radar network covers now almost the whole Scandinavia, northern parts of Germany, most of Poland and Finland and the Baltic States. Even westernmost parts of Ukraine and Belarus and just recently part of Greenland! And those Swedish chaps are willing to expand their network if they can find people who own the needed receiver and want to join the network.
Just click the Flygradar tab. But... using Internet Explorer as your browser may jam your PC. It sure did jam mine. Use Firefox browser instead.