Hello, I´m new in this forum, I´m from Argentina, sorry for my poor english.
I need to make a radar detector for marine frequencies for a friend of mine who has a small boat. I was looking for a circuit diagram but I just found a "economy" radar detector with a capacitor like antenna and an operational. I don´t have knowledge about high frequencies, only that the tunning is very difficult.
anybody could help me to find a good circuit of a marine radar detector?
Thank you very much!!

Manuel