Maybe give them a call and say the radar is causing interference to your WiFi in the 5Ghz band and can they tell you what channels they are using so you can stop using them.
I live in a radar hell-hole, surrounded by military activity, next to the biggest shipping lane in the world, and incidentally underneath the preferred flight path of cargo operators moving specialised loads in AN-124s (old weather radar), with frequent bad weather and storms (a bit like Wellington, but without the cable car).
Some (older) airfield weather/ILS systems can cause WiFi issues, these systems tend to be used infrequently. Fortunately, it isn't as bad as the situation close to Schiphol's rather distant fifth runway where the radar causes WiFi "failure" frequently in bad winters.
Apache helicopters have sensors that detect WiFi sources and other "anomalies". There are a couple of helipads about 400 metres away. When they detect my WiFi they turn to face me and do the "bee dance", before leaving with a wave.
On balance I am quite sanguine about radar interference as the systems used to detect and warn against windshear conditions save lives. Windshear can catch out even experienced pilots.