thx on a quick respone. Is antenna on your link the right one for Magellan ProMark500? How can I be sure excatly what model of anttena my instument requires? I can se there is diametar, lenght, male/female, gain and impedance. Is there something else I must look for?
But if this link is ok, I will buy it immediately (As I can see on picture, that's right one).