In 1929, the Navy acquired 8.4 acres near the Jupiter Inlet Lighthouse for an installation to broadcast weather information and monitor ship to shore and aircraft distress calls.

The Loxahatchee Museum occupies the last remaining building from the important World War ll installation that was called a US Naval Supplementary Radio Station named Station J.

Station J was close to the WW2 action when merchant ship carrying war supplies from Europe and the port of New Orleans travled near this coast, where German Submarines lay in wait.

The first half of 1942 six ships were sunk during one week off the Jupiter Inlet so somethng had to be done.

Station J was a secret operaton to intercept U-boat message and warned Allied ships to help the US Forces attack enemy vessels. Station J's radio receivers could pinopoint locations and names of the submarines which would surface each night to charge their batteries and send locaton and weather reports to their home bases.
In May 1943, 30 German subs were destroyed and in June another 37 subs. Also in 1943 Station J reached its peak with 12 acres and 95 men on site, plus 11 Marines. The station had 24 radio receivers, two barracks buildings, rec hall and administraton building, a emergency power house, garage, workshop, dispensary, service store, tennis and volleyball courts, and quarters for families of six married men and their families..

The town of Jupiter had a population of about 200 people. Following the war Station J was closed in 1945.

In 2006, the Town of Jupier received a $1.1 million restoration of the married men's quarters which is now the headquarters and museum fo the Loxahatchee River Historical Society.