AT & T televised the 1940 Republican National Convention to a few hundred receivers over the NBC station W2XBS .
AT & T used the coaxial link to transmit the Republican National Convention in June 1940 from Philadelphia to New York City , where it was televised to a few hundred receivers over the NBC station W2XBS ( which evolved into [ [ WNBC [ [ ) as well as seen in Schenectady , New York via W2XB ( which evolved into WRGB ) vis off-air relay .
Television network