Hey @tom_l , since you know enough about these things to do this mod, I was wondering if you might be able to offer any comments about whether you think something similar could be attached to these fobs (round black thing) that some of us are using to control a door lock? I don’t know where the real reliability issue lies but adding an antenna seems like a relatively easy and worthwhile solution attempt?
If you think the technique could be used, could you describe or link me to suitable antenna?