It worked under rainy conditions under oak and beech canopy (worst test conditions I could find :-)) and my results are within a meter, although I sometimes had to wait a little for the unit to aquire the sbas signal. In optimal conditions we get typically less than 50 cm.
I have no experience near tall structures/buildings, we are a forestry, but I suspect the reception of any gnss antenna without correction signal will be worse when the line of sight to the satellite providing the sbas is broken. You might need a system with a separate correction signal subscription.
I had three units for testing: Stonex 500, failed for us because it isn't whitelisted for (nor working with) iOS which my company requires, a Trimble R1 and the arrow 100 and I found the Arrow 100 better than the Trimble with quite a margin, tested them alongside in the same wet conditions.
These are all apparatus which need to be linked to a mobile device. For us that's a plus because my collegues already are familiar with using collector so after coupling the device they work as usual, only more precise.
Where Stonex 500 and Trimble R1 are 'boxes' (one unit) the arrow series comes with a separate/external cabled antenna, slightly less comforable, the external antenna is mandatory.
The antenna sits in a pocket on top of a baseball cap so the highest point and you keep your hands free, the unit itself sits in a pouch on your belt. There seems to be a pole-on-a-vest solution so you can get more height, the cap is good enough for me.
I was able to test the unit(s) before I made the decision which one to buy, you may be able to do the same.
Regards,
bert
