Very possible. I have a 7762 like this, however it's not at ground level. I have omni external antennas on it and can connect to a low-but-usable signal with a laptop inside a house 150-ish feet away. Course, that 7762 is in clear air, not against a block wall, but since the block is the opposite direction from the outdoor area where the signal is to be used, I wouldn't hesitate to do it.
Depends also on how far you want the signal to extend along the ground level.
I'll get a photo of my setup from a distance to give you an idea how it works for me.