Reception of my RB has improved dramatically: I can see every aircraft surrounding Barcelona Apt (Some times up to fifty aircraft). I can see traffic departing/arriving from/to LEPA airport that is about 110 NM away from my home, at the minimum altitude of 6000 ft. Considering I have not the antenna placed on the best location yet, this is a pleasant performance of the RB.
To Fernis, regarding the faulty antenna: Since Airnav Systems is the seller of the entire equipment I have bought, this takes the ball on Airnav´s roof, no matter who has supplied the materials they are selling.
I would like to thank every one who has tryed to help me: THANKS, THANKS, THANKS.