OK, decided to do a tried and true method(for me at least) of getting back into modeling...I always seem to go to Starfleet Museum and do 1-2 of these things...guess I need to work my way up to the newer stuff.
This is a ship that was used in the Earth/ Romulan War to facilitate timely communications between ships on the frontline and command(before they used ftl torpedoes to communicate), greatly increasing a patrol/task forces effectiveness. This is a redesign of the Baikal class, which was a Bison class re-fitted with a subspace transmitter array, tho it's effectivesness was limited to the fusion reactors power output limitations. The Marconi class was a refitted Tannhauser class, with the same M/AM reactor, therefore providing the necessary power.
Anyway, you can read about it at SFMuseum.