Nice @nico1966a. If you want to test if your node can reach Bloemhofstraat, then send me a PM and I'll move my single channel gateway upstairs. (It's on the 2nd floor right now; I can move it two stories higher; SF12 on channel 0, 868.1 MHz.)
(I got a 500 meter range this weekend, but while I was walking around the Spaarne river, the WiFi failed on the gateway, so I did not get any further readings after only 15 minutes of walking...)