Edwin Corley, The Jesus Factor, 1970
United States
USS Edward White
'Communications Ship', class not specified
Described as looking like: "...a floating antenna farm..."
Helipad fitted aft.
No other details provided.
Note: This is most likely what is known as a 'Tracking Ship' a vessel specifically intended for use in the space program. However as noted there is insufficient detail to determine if the author had a specific real world prototype in mind.
Plot summary: It is the 'Day After Tomorrow' (The main plot takes place between August 2 to August 16 of an unspecified year, which cannot be later than 1974, the year BOAC became British Airways.), the world stands on the brink of World War III. A politician desperate to bring a peaceful end to the crisis discovers evidence that something does not quite add up, just what is 'Project JF'...
Note: Edwin Corley wrote a number of thrillers, one of which 'Sargasso' (1977) I have covered earlier in this thread.