i read that its have 2 antenna's so you better take the Patroller / D3 those have 3 antenna's and one of those is for depth reading , and yes they work fine on the B&F collar
put a pice of tape over the speaker and dont use the searche/send button but only the on/off switch on the site.
i dug some in hungary last year and they where ok but you have to be lucky to find a good one for earthwork ,, moost are used by weekend hunters (lady's) and blood trackers / roe deer hunters