It depends on what kind of tag they are. If they are far-field tags you will need to measure their Radar Cross Section using a transmitter and sensitive receiver, such as a spectrum analyser, using the modulation to make the tags stand out from the background and breakthrough.
If they are near-field then you can put them in the centre of a coil or solenoid and measure the mutual coupling between them by detecting the change in impedance with the tag there or not (or switched on or not) - which is the way the tag is read, except that having it in the centre of a small coil makes the signal bigger and enables you to calculate the field more accurately so you can measure the tag more accurately.
You will of course need to carry out your measurement at the tag operating frequency.
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