Crossword puzzle clue "1950s rca innovation or this puzzle's four longest answers"

1950s RCA innovation ... or this puzzle's four longest answers?

Org. that has four teams with non-plural nicknames, which begin this puzzle's four longest answers

RCA TV innovation

How many letters are in the longest answers in this puzzle - or how many of these answers there are

Word that's "shifted" in the first four letters of the four longest answers

Angle irons graphically represented by four sets of black squares in this grid, and by letter formations starting in the four longest answers

"Dog the Bounty Hunter" network, and a hint to the theme in this puzzle's four longest answers

Place to live (different ones are hidden in this puzzle's four longest answers)