ATC,
Your english is very much better that my Russian but communication is difficult, I hope I am now picking up on what you mean.
When you get your radarbox at first, the polar diagram covers a very small area and is spikey because you have had few contacts. As you pick up more contacts over a course of time, say a week or more, the polar diagram coverage will get bigger and fills between the spikes. It will thereafter not change much.
Hope that helps.
Alan