Reception really bad

Wanted to install the antenna on my KIA Sportage because the standard antenna like remains times hanging on tree branches and bushes. Min again dismantled Unfortunately after 30 because the reception is really bad. Move me with my car always on the edge of the coverage area of ​​a local transmitter and the antenna series has in about 50 km from the city clear reception. This unfortunately is no longer clear the place of residence, and the further I move away, the worse it gets.
Too bad, but here I can not even pronounce ausnahmweise Enpfehlung ....