I need to construct an antenna for a reader that will pick up a 134.2 kHz RFID tag.
The antenna will need to be in "tunnel/culvert" under a road. The tunnel is 2 metres wide, so antenna needs to be lie across that distance. The animals carrying the tag are frogs so only a few cm normally above the antenna (they normally just "crawl"). However, Frogs do jump sometimes too so it may have to read a bit higher than that. It sounds to me like even ten cm is a bit of a stretch for these....true? false?
Any advice on what an antenna of this length (it would have to go across and back as a loop of course) would need to be made of and how to tune it to give me a starting point for further research would be appreciated.