Have read on another (non aviation forum) that the airport has objected on security grounds and requires the owners to make application through official channels. I would think, even if they did, permission would be unlikely. Its mounted on a building at the other side of the road that passes the airport boundary. As you say, nice well it lasted..
When I looked at the live stream this morning the two aircraft in view were a Ryanair landing and an easyJet about to take off, both from/to my local airport at BRS (checked with FR24 to see which aircraft they were). They were the only aircraft in sight at that time. That was something of a coincidence.