I noticed this on the side of a house I passed one day a couple of weeks ago and it amused me...
Meaning that the secondary reflector ought to be "very small"!The zone 1 could be the primary reflector in a Gegorian install.

Possible but somewhat unlikely because the block of flats is fairly recent (around 8 yrs), and thus also the dish installation - thus I assume that the dish is working, or at least was working after it was installed!Or it's not connected at all!
Cloudy!Thoughts?
an internal aerial would have probably sufficed.
Thankfully not Antiference. Televes ?
Possibly not - because that prefab building is probably metal and that would make it a pretty good Faraday cage, which will screen out most of the signal!an internal aerial would have probably sufficed.