I tried to do a miniature replication of Meyers device which can be seen in the picture in the attachment: On the top left you see the Voltmeter which is connected to a rectifier. The rectifier is on the bottom left and consists of 4 Silicium Diodes. The miniature device is on the right side and also correctly attached to the rectifier. The magnets are strong neodyms (lift 4kg) and the zinc plates are in fact steel plates and zinc only on the outside (pure zinc cannot be bend, they would break! I still wonder how Meyers did them). The Voltmeter on the top left shows 0 Millivolt, but later on I got a constant voltage of about 0.6 milliVolt in general (which is almost nothing though...).
The result is far away from the claimed 4-8 Volts from Meyers. Roy Meyers though claimed: the device should be elevated about 50 or 60 feet high. Sounds like an antenna somehow. Could it be that Roy Meyer only caught electromagnetic waves from radio stations?
For experimentation purpose, I wanted to know how much voltage I could catch from radio waves. I removed my device from the rectifier and attached 2 cables on it (which were the same length as the cables from the „device“ extending to the rectifier) loosely hanging in the air. The result was an exact same 0.6 milliVolt as before. Interesting... it shows, that my „device“ with the zinc plates and magnets was absolutely useless...
Now let's take another experiment: I connected a 3 meter long cable to the rectifier with the following result: 150 milliVolts! Much better that way - caught by a simple cable.
Now remember that if Roy Meyers put a cable some 50-60 feet above ground, he would certainly have measured much more milliVolts, most certainly some full Voltages, simply because of catching electromagnetic-waves from radio stations. He also claimed it did not matter if he put the magnets North to North or South or the magnets South to North/South. Could it be that he had some Radiostation North or South to him and therefore he got better results?
If we look again at his own pictures you can also say, that his "antenna" consists of 2 sections: a vertical section (the cable leading from ground to 50 feet above ground and also doing most of the EMW-catching) and a horizontal section (magnets, zinc plates). Now if you would rotate this horizontal section it is clear that if you catch a radiosignal could be amplified a bit more, depending on the direction it is pointing, preferably a radio station. Nothing uncommon about it, although the magnets/zinc would be obsolete. Some simple steel rod aligned horizontally would have done the same in my opinion (compare to common TV antennaes).
In my view I conclude that Roy Meyers only achieved to catch electromagnetic waves from radio stations and nothing else, which is disappointing. I really hoped to gain some interesting effect.
Of course someone may claim in respect to my "device" that everything is maybe too small (magnets and their distance from each other, zinc plate size), that I didn't use the flatcoils Roy Meyers used in his rectifier, his mercury vapor lamps, etc. but then I'm asking:
Would it make a difference, if someone could catch the same energy anyways with a simple long cable? Put some 100 cables side by side and you'll receive a 100 Voltage . This energy though is not free. Imagine all radio stations shut down one will end up empty (0 Volt) as well. Sure it would be possible to make a huge net to catch even more voltage

but if everyone would do that, it would lead to big "holes". Maybe usefull for a „free“ battery charger

But as Steven has replicated some years ago the „Horseshoe experiment“, with the same result I think there is nothing more to get. Even if there would be something – how would one distinguish the „free EM-waves“ within all these Electric smog from todays technology? No way.