It's about 75 feet. The WMR200 is inside my house, in our "office" so it can be connected to my computer. The sensor is outside the house in a greenhouse that is a metal frame and double-wall poly-carbonate. Between the two is one inside wall, one outside wall, some cabinets and it may slant down thru a hot tub and a deck. It's a bit hard to tell... I moved it from the center of the room (where there was a metal filing cabinet in between and maybe a dryer) to on top of the metal cabinet and that helped but it still looses connection occasionally. Seems like I need to get a longer USB cable and figure out the optimal placement for it.
The slots on the back to hang it on the wall aren't great
but that seems like what will work the best.
Sad that there's not just a repeater - the RT918 worked reliably for me with the WMR968.
I'm curious about the antenna mods? Do you have links? Also, seems like I could also put a corner reflector behind the sensor? Any plans / diagrams folks have made for that?
Thanks,
Jerry