Just returned form 10 days in an Italian Boatyard, Talk about METAL!!!!!, Welders, Grinders, Torch cutters, ,10' mountains of scrap metal stacked up in rows, Brass, Steel, Tile, Aluminum roofing strips, you name it...EVEN kitchen sinks!.. The Paralinx Arrow + worked great!. I was never further than 60' from my Director and her Monitor but it never broke up on ship.
The only time it did break up was when I was under the ship in the dry dock. When I crossed to the other side of the supports under the ship the signal broke up and stopped being received all together, but in all fairness here is the description of what was between me and the receiver/monitor....
Blocks of cement 8' wide, by 36" thick, by 4' high, then a 1/2" thick metal frame above them, with an 8' long x 36" thick by 24"high solid block of wood. I don't think anything would transmit thru that.!. The roof was 6' above the concrete floor and was the Underside of the 101,000 Ton 1000'+ long Cruise ship.
Kudos to Paralinx and to Aaron at Hot Rod Camera for the quick service and shipment in a pinch!.