[PhaseLockk]

If you click through to the datasheet, you can see the frequency response of each of the 5 probes. Each probe is capable of picking up signals down to low frequency, but they only have good gain around a particular frequency band. So it's not as if this is one probe that is equally good at detecting all frequencies.

[peter_d_sherman]

Hmm... antenna (aka frequency probe) shape vs. gain... someone should make a table of those... actually, even better would be a chart with various combinations of antenna shape, material (e.g., metal/alloy A vs. metal/alloy B), and frequency response... even more interesting might be trying various different meta-materials, fractal shapes, etc., etc... Note to future self: Here might be some interesting experiments...