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I dug into my files and found some old research that elaborates on a few animal reactions to naturally occurring infrasound. Explains why no animals died in the 2004 Indian Ocean tsunami. The underlying merit of the paper is safety. Infrasound is difficult to impossible to attenuate. There has been research on reducing wind noise with 8lb polyurethane foam. Perhaps a hat made from 8lb polyurethane foam topped with tin foil 'Devo' style. https://www.ndt.net/article/ultragarsas/Vol.64-No.3-2009_06-Guzas.pdf

Depends on the length of the antenna. For fun, Google for a conversion calculator site for frequency to wavelength. Diaper up. Plug in a few infrasonic frequencies. I am not sure if ELF is still used to communicate with submarines. There is a site in Washington State that can be used for submarine speak. The Jim Creek Naval Radio Station. The antenna is huge and only for one way messages to subs. Infrasound detecting apps are available for smart phones. The caveat is that the microphones in smart phones are designed for human voices. The mic and other elements of the phone may vibrate / have resonances that influence the display on the phone. The apps are free / low cost so go for it. Visit a zoo and scan the giraffes and elephants and hippos if they are available. Measurement microphones are designed for infrasound. If the target is not in an anechoic chamber, extraneous sounds will be picked up and that is the reason that a measurement microphone in a forest environment will receive a smorgasbord of constantly changing natural sounds.

No. We have about 44 lightning strikes per second on Earth. Those are sources of the Schumann frequencies. The ionosphere is a variable height wave guide and the Schumann peak frequencies constantly roar around the planet. The frequencies in Hz are: 7.83, 14.3, 20.8, 27.3, 33.8. Everything on Earth vibrates. The debate on human vibration rages on but a range of 9 to 16Hz is accepted. Non lightning sources can be volcanoes, air turbulence, earthquakes, seismic activity. Rotating electrical equipment can be a man made source. Electric motors can irritate humans. Wind generator farms are being monitored for harmful noise.

Good questions. Speculations only of course? I suspect what is infrasound to us is not necessarily infrasound to them. Just based on personal experiences out there, I'd say the bottom end of what I've experienced would be 7-8 Hz if it was infrasound. Maybe that is within their audible range and not something they have a need to be isolated from. So our hearing stops at 20 Hz if we're in perfect health, maybe theirs drops to 7-8 Hz. And how many frequencies? Maybe it is jumbled harmonics among frequencies that produce the sick feelings if it is really infrasound. Perhaps infrasound manipulation is a learned/developed skill .. like singing is for us. Maybe the little ones are like our little ones trying to sing. Fingernails on a chalk board of sorts. Speculation at best! But certainly things I've pondered even if I have no way to test them.

There are a couple things to study up on. One is brain wave frequencies which represent, alpha, delta, etc states .. they get a lot of hype in the woo woo circles and much is, imho, crap. Deep end. However, behind the misuse of terminology and so on there is science. This is a decent description: https://www.researchgate.net/figure/Brain-waves-charts-description_fig1_325701712. The other is brain wave entrainment. A bit of info here: https://en.wikipedia.org/wiki/Brainwave_entrainment. The implication is that sufficiently powerful infrasound can force the brain waves to synchronize to its frequencies and thus more or less force the "subject" into a particular mental state .. fear, agitation, relaxation, etc. There seem to be medical ethical issues with any deliberate further testing so there aren't absolute results to draw on, only bits and pieces which to me seem to fit together. There was nothing in the white papers I read about getting sick though it is in the bigfoot literature. A wild, speculative guess is that could be a result of too much power and not precise enough frequency control. Anyway, as to your question about "so how do you know" .. I don't. Not really. I don't have equipment to detect or measure infrasound. However, what I experienced under Devil's Lake brings to mind theta state, essentially a waking trance. It's the best explanation I can find for being in what should be highly stressful situations, aware of them, yet absolutely disconnected from the emotional impacts those situations should have had. I'm open to other ideas but they have to have some science behind them, not just new age gack or ignorant dismissal. SOMETHING happened. I want to understand it. What I've read about the frequencies of brain states and brain wave entrainment seem to be the best fit I've found so far.