We moved our The Things Network gateway (FFFEB827EB686374) for TTN-CH from top floor office (inhouse) to the rooftop of our building. By this change coverage in Glatttal is significantly increased. See below picture of our gateway antenna and a map showing some coverage data. Change of RSSI between indoor and outdoor with new antenna ~16dB.
With this change Wallisellen, Schwamendingen, Opfikon, Brütisellen, Wangen, Dietlikon and Dübendorf have basic coverage with The Things Network.
Interactive map on gist.github.com