It Reads....

"SITE OF FIRST UNITED STATES

TRANSATLANTIC WIRELESS TELEGRAPH STATION

MARCONI WIRELESS TELEGRAPH COMPANY OF AMERICA

PREDECESSOR OF RCA

TRANSMITTED JANUARY 19, 1903

THE FIRST U.S. TRANSATLANTIC WIRELESS TELEGRAM

ADDRESSED TO

EDWARD VII KING OF ENGLAND

BY

THEODORE ROOSEVELT

PRESIDENT OF THE UNITED STATES OF AMERICA"