Multipath signal

[LiveATC]

Hello, developers of the program!
I wish to show you pictures, by means of program Squawkbox and Google Earth, I want, to show you areas where airplanes vanish, these areas are designated by red colour. Tell, whether it is possible to change it? Well to learn from users who are near to me, and can help me.
For the information: I am location  in Estonia, Taliinn.
Altitude of the aerial of 45 metres plus the amplifier

I am sorry for  my English

With kind regards .