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Thanks for the report on your experiment. Try it with more separation between the transmit antenna and the monitoring antenna. It appears from your pictures that they are too close together and you are getting more capacitive and inductive coupling than you should and this is swamping the actual radiated field energy effect. Separate them as much as practical to get a usable reading on the scope.
Mine is 6 feet away from the transmit antenna and is at right angles to it to minimize this coupling. There is a definite peak at resonance. You are probably right about an analog meter being easier to read than the scope. Here’s an idea you might try: Connect a diode to one side of the coil, a capacitor (.01uf for example) from the other end of the diode with the other cap lead connected to the other side of the coil and connect a DVM across the capacitor. The DVM is much more sensitive than a D’Arsonval movement and may have the sensitivity required to give a meaningful reading. Use a 1N34A or other germanium diode if possible. I haven’t tried this so if you do let us know what you find.