Another possibility is the Sonoff 433 MHz to WiFi bridge and their 433 MHz contact sensor. They claim a range of up to 50 Meters.
There's a Hubitat community integration, but my understanding is that it doesn't read contact sensors, but The HA integration does.
Both require that you flash the Sonoff bridge with Tasmota, so there's that extra layer of complication. Not to mention that you would need to add HA if you don't already have it. Knowing what I know about how many additional devices and integration opportunities that opens up when you add HA and Home Assistant Device Bridge to Hubitat, that's a no brainer. However not everyone is keen on adding another smart home platform, regardless of what opportunities it can unlock for them.
