It is Belgium.
Transmitting station Wavre - Overijse
This double name is to make it Flemish/French, since the 2 language groups are rivals.

I ve been in there when it still was in operation.
After the entrance you find the French language transmitters on your left, and the Flemisch, Dutch on your right.
At that time 540 Radio 2 VRT and 621 French first programme were still on air.
The SW was not in use.

On the site there are also TV transmitters, a 1000 feet tower once came down in a storm.

I guess it is there now only FM and digtal radio and TV, not in that building.

There are more video's made by unwanted visiters of thet building.