Experimental broadcasting had begun in the 1930s and television stations had been commercially licensed beginning in 1941 .
It was not until 1946 that coaxial cable connections allowed stations to share the same program schedules .
Although experimental broadcasting had begun in the 1930s and television stations had been commercially licensed beginning in 1941 , it was not until 1946 that coaxial cable connections allowed stations to share the same program schedules .