Abstract: As opposed to microwave signal which coverage is restricted to LOS propagation, HF signal can propagate over-the-horizon (OTH).The Exclusive Economic Zone (EEZ) of a country spans 200 NM from its shore and it requires constant surveillance in order for that country to know the locations, identifications and activities of all the ships within it. Potential threats could be various, like illegal fishing, illegal immigration, smuggling, terrorism, theft of goods and oil from transport ships and tankers.