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Postcard image, from around 1910, of the 128 meter (420 foot) tall Brant Rock radio tower.

Although Fessenden's antenna in Brant Rock, Massachusetts was demolished in 1917, the insulated base on which it stood still survives. The layers of concrete were originally separated by arrays of ceramic insulators.

Ocean Bluff looking south

Ocean Bluff-Brant Rock is a C.D.P, census designated place, consisting of the villages of Ocean Bluff and Brant Rock in the town of Marshfield in Plymouth County, Massachusetts. Its population was 5,100 at the 2000 census.

In January, 1906, Reginald Fessenden achieved the first two-way transatlantic radiotelegraph transmission, exchanging Morse code messages between his stations in Brant Rock and Machrihanish, Scotland. (Marconi had only achieved one-way transmissions prior to his date). On Christmas Eve, December 24, 1906, Fessenden transmitted from Brant Rock the first audio radio broadcast of music and entertainment in history. Radio operators on ships in the Atlantic heard a broadcast that included Fessenden playing the song O Holy Night on the violin and reading a passage from the Bible.

Ocean Bluff and Brant Rock are located at 42°6′6″N, 70°39′39″W (42.101561, -70.660787)^GR1. They are 2 quaint seaside tax nutrient "Villages" of Marshfield MA.

According to the United States Census Bureau, the villages have a total area of 11.3 km² (4.4 mi²). 5.3 km² (2.0 mi²) of them is land and 6.0 km² (2.3 mi²) of them is water. The total area is 53.09% water.

Ocean Bluff (02065) and Brant Rock (02020) contain 6 public beaches: Sunrise Beach, Ocean Bluff Beach, Brant Rock Beach, Blackman's Point, Bluefish Cove, and Rebar Beach.

As of the census^GR2 of 2000, there were 5,100 people, 2,004 households, and 1,320 families residing in the villages. The population density was 960.5/km² (2,489.5/mi²). There were 2,657 housing units at an average density of 500.4/km² (1,297.0/mi²). The racial makeup of the villages was 98.35% White, 0.29% African American, 0.08% Native American, 0.29% Asian, 0.29% from other races, and 0.69% from two or more races. Hispanic or Latino of any race were 0.53% of the population.

There were 2,004 households out of which 32.4% had children under the age of 18 living with them, 49.2% were married couples living together, 13.3% had a female householder with no husband present, and 34.1% were non-families. 26.5% of all households were made up of individuals and 8.2% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 3.14.

In the villages the population was spread out with 25.5% under the age of 18, 5.9% from 18 to 24, 33.0% from 25 to 44, 25.1% from 45 to 64, and 10.5% who were 65 years of age or older. The median age was 38 years. For every 100 females there were 94.7 males. For every 100 females age 18 and over, there were 90.1 males.

The median income for a household in the villages was $56,840, and the median income for a family was $60,552. Males had a median income of $42,388 versus $35,902 for females. The per capita income for the villages was $24,292. About 3.1% of families and 5.3% of the population were below the poverty line, including 7.6% of those under age 18 and 3.4% of those age 65 or over.

• Ocean Bluff-Brant Rock, Massachusetts is at coordinates 42°06′06″N 70°39′39″W / 42.101561, -70.660787Coordinates: 42°06′06″N 70°39′39″W / 42.101561, -70.660787