A long time ago, when the world hadn’t known that it’d one day be capable of inventing the best handheld cb radio, on Darby Road in Scituate, Rhode Island, near the top of the 7th-highest point in the state (732 feet above sea level), is the site of what was once one of the nation’s best kept secrets during World War II: the Chopmist Hill Monitoring Station. In March 1941, the Federal Communications Commission’s Radio Intelligence Division (RID) set up a network of 13 top secret radio monitoring facilities designed to eavesdrop on German and Japanese radio traffic.

A top agent in the RID was a Bostonian by the name of Thomas B. Cave. He not only discovered the site, he was to command the monitoring station right through the end of the war. His initial assignment had been to set up a connection with an existing direction finding station in Bar Harbor, Maine (similar sites were being established along the Eastern seaboard prior to the entry of the US into the war). While traveling around New England, Cave discovered the 183-acre farm, owned by William Suddard, atop Chopmist Hill. It didn’t take him long to figure out that this location could do a lot more than help triangulate a radio signal.

By an odd coincidence of terrain and atmospheric conditions, this particular property turned out to be the most effective of the RID’s national network of stations. Suddard and his family obligingly leased their home and property to the government and moved out for the duration. A team of 40 radio operator technicians quickly arrived to set up shop in the 14-room farmhouse.

Narragansett Electric Company linemen were called in to set up scores of utility poles and string some 85,000 feet of antenna wire (about 16 miles worth). Over the next few years, they would be called back periodically to move some of the poles, sometimes by only a few feet. This wasn’t easy since the poles were sunk deep into the ground to keep them below the tree line for security purposes.

The linesmen were never aware of why they were performing the tasks. One company crewman,  Charlie Weinert, said after the war, “If I had known what was going on I would have dug the poles all the way to Cairo!” The long wire antennas and other receiving antennae were connected to the farmhouse where technicians set up six rooms full of sensitive radio receivers and transmitters. A pair of outbuildings housed two sensitive direction finders. Chopmist Hill was in business.

“If I had known what was going on I would have dug the poles all the way to Cairo!” — Charlie Weinert

The farmland and buildings were surrounded by barbed wire and powerful security lights. An emergency generator provided backup power. Staff lived in bunkhouses on site. Armed guards patrolled the area. A warning sign on the approach road read, “In the event of an enemy attack on Rhode Island, this highway will be closed to all save military vehicles.” Local residents figured something was up, but they had no idea what. Actually, the technicians themselves were not fully aware of the ultimate use of their activities and the material they collected (although they probably had a good idea once America entered the war and the scope and amount of information mounted up). Working in shifts 24/7, the technicians monitored signals broadcast in the clear and also copied down encrypted messages. All information was relayed by teletype to Washington for appropriate action, often immediately on receipt.

Right away, operators began to listen to transmissions by German spies in North Africa and South America and exchanges between German headquarters and military units in Europe and North Africa. Once the spies’ signals had been identified, they could be rounded up and, in many cases, turned to counterespionage purposes. American intelligence agents’ transmissions were also monitored and, if it was discovered the enemy was on to them, they could be warned. The Chopmist Hill equipment was so sensitive and the location so ideally situated that the technicians could pick up low power radio signals between General Erwin Rommel’s Afrika Corps tanks and relay critical troop movement information to the British.

The Rhode Island station personnel also monitored weather reports that were key to enemy activities. Access to local weather information assisted the British and later, US Army Air Forces in setting up bombing missions. German strategic and diplomatic transmissions were broadcast on frequencies that could not be picked up by the British but did bounce across the Atlantic to Scituate. These were relayed to the British before and then after the US entered the war.

The station was also able to pick up Japanese transmissions from the Pacific. Then FCC Commissioner George Sterling, in an interview conducted long after the war was over, said he was surprised that the US was caught unaware at Pearl Harbor. He told a reporter that for several months before December 7, 1941, the Scituate monitoring station was routinely intercepting Japanese military transmissions that indicated some action was pending (US cryptanalysts had already broken the Japanese code). During the war, the Chopmist Hill station helped defeat Japanese attempts to bomb the US mainland with TNT-laden hot-air balloons equipped with small transmitters to help the Japanese keep track of their progress. Scituate picked up these low power transmissions thousands of miles away, relayed the information to Washington and US fighter planes were dispatched to shoot the balloons down. A few managed to reach the US, but their existence was kept a deep secret by the government.

At one time, Chopmist Hill even helped save the famed Queen Mary from being sunk with more than 10,000 troops aboard. The ship was in Brazil, about to sail for Australia. German spies in Rio de Janeiro had discovered the ship’s sailing schedule and route around Cape Horn and radioed the information to Nazi headquarters. German U-boats were ordered to sink the liner at all costs. But, thanks to the Scituate monitoring station, the Royal Navy sent last minute secret course changes to the Queen Mary, and she arrived safely in the Pacific with her precious cargo of fighting men.

The head of the German Navy’s U-boat service, Admiral Karl Doentiz, thinking his transmissions were secure, kept up continuous radio contact with his submarines throughout the war, unaware that even with sophisticated encryption machines, his electronic mail was being read.

In yet another incident that demonstrated the unusual sensitivity of the monitoring facilities, receivers picked up a signal from a remote transmitter near Alaska’s Aleutian Islands. It turned out to be a nearby Russian station and the location, at first thought to be a Japanese facility, was saved from a US air attack.

Chopmist Hill technicians also assisted in air-sea rescue missions, using direction finders to zero in on downed aircraft around the world. Among those saved were 22 wounded soldiers whose plane went down in Labrador and popular entertainer Kay Francis whose plane crashed in Florida while returning from a USO tour in Europe.

It does seem a little hard to believe that a spot in Rhode Island could play such a vital role. Army officials were skeptical, and so the FCC’s Sterling guaranteed them his technicians could pinpoint the location of any transmission within 15 minutes. The Army set up a test, sending a signal from inside the Pentagon. Seven minutes after their message was sent, Scituate reported receipt and location.

In November 1945, after the existence of the station had been revealed, the government allowed Thomas Cave to be interviewed by the Providence Journal. He told the reporter that “virtually all the wartime messages sent by German spies in the US were intercepted in Scituate.” After the war, Cave and a few other technicians stayed on to continue monitoring activities, this time focusing on illegal domestic radio transmissions, that wasn’t allowed at that time, although now a days if you want to do a transmission you could simple go to this weblink to get the proper legal help to get an approval for this.

There’s one more twist to this story. And that revolves around the interesting fact that Chopmist Hill was briefly considered for the site of the headquarters of the United Nations. In January 1946, a team of inspectors visited Scituate. The UN had agreed to set up shop in the United States, and a Scituate town councilman and local forest ranger, George Matteson, convinced the UN inspectors to pay a visit.

They were especially impressed with the fact that Scituate was able to serve as a unique worldwide communications hub. There was enough available land to build the anticipated facilities for the headquarters. It was within easy access to air transportation and a relatively small number of people would have to be relocated. Governor (later Senator) John O. Pastore met with the inspection team and pressed the case for Rhode Island. But, alas, the state didn’t stay long in the running. New York City was chosen after John D. Rockefeller, Jr., gave the UN $8.5 million to enable them to purchase their ultimate location along Manhattan’s East River.

So Chopmist Hill quietly returned to its pre-war bucolic existence. The FCC stayed until 1950. The State of Rhode Island then took over the property and used it as the state’s Civil Defense headquarters for the next 15 years or so. Eventually, the property reverted to private ownership.

Small traces of the station remain to this day, with stumps of the utility poles still visible. The former Suddard farmhouse on Darby Road is an attractive private residence behind its original stone wall. There are few, if any, visible clues to the secrets that it once held. The area is surrounded by new homes, equipped with modern electronic devices that were only imagined when those World War II radio technicians conducted their clandestine activities.

There could be a few more secrets still to be revealed. As it happens, not all of the activities of Chopmist Hill have been made public. Some still-classified documents about the monitoring stations will not be released until 2049.