This move to Secaucus, was because the FCC was going after RKO's General licenses, RKO owned WOR-TV and may other TV & Radio stations around the country. The move to NJ by WOR kind of help Channel 9 & RKO in its dealings with the FCC, but not totally - the FCC was still pressuring RKO to sell and they finally did.
That was a long time ago. Since then, the station was sold and then resold. It's now owned by Fox, and they left Secaucus 8 years ago. They consolidated their offices in Manhattan with co-owned WNYW TV. Once again leaving NJ without a broadcast TV station.