There's a lot of 433Mhz replicators on the UK market. A lot of HA stuff here uses that frequency although zwave for one uses 868.42Mhz.

The us uses different frequencies.

I bought a 433Mhz one when I wanted to replicate a door bell push button. You had to be close to the device you were copying with that one so I guess that most of these replicators would be incapable of picking up signals from across the road.