Hi Andrew,
The link I posted is to a kit for the mag loop - it’s not a commercial product per-se, rather that the publisher of the magazine where the design was covered, produces kits from articles - in this case they provide the etched PCB that is the actual antenna plus the other components. At €12 plus €6 shipping, I’ve ordered one - just to see how it performs as a directional antenna for an FM HT. Probably not an antenna for a portable field day station in the vast emptiness of the Australian bush, rather one to include in with the HT when travelling.
73 Ed.