Suddenly, on the road between Hanga Roa and Anakena (the little beach on the north side of the island), I noted something vertical with red and white parts - certainly an antenna! It was not too easy to find a way to that place, but with the usual trial and error method I reached the area, at least close enough for the tele to get some view:

two isolated towers, and a dipole antenna.

My guess is, that this is the antenna farm for Pascua Radio, which was at that moment (june 2018) out of service. When I visited Valparaiso Playa Ancha Radio, the director told me, that Pascua Radio will soon be re-activated, approximately in late 2018. So it all makes sense - the abandoned antenna farm, in good shape, and the absence of any people in the house or on the ground.

See the dipole:

and a closer look at the 2 monopoles: