

What makes me worry is the size of the “reflector”. I wonder what symbol rate it is possible to get if the “reflector” is literally everywhere above you - the time delay between start of reflection and end of reflection might be considerable.
I found a resource with practical advise about using NVIS, including using meteorological data (ionograms) to determine the best frequency, antenna diagrams and such. (His drawings are in Spanish, but I think most English-speakers can decode Spanish antenna diagrams with a few clues, since meter is metro, and frequency is frecuencia.)
https://www.ipellejero.es/hf/NVIS/english.php
Some additional interesting antenna designs (vertical yagi on ropes, spiral antenna, etc) and propagation shemes, can be found in this research paper.
They have a passage which addresses data rates, and the data rates are poor…
In [110] two alternative channel access technologies are tested and compared in wireless mesh networks: Automatic Link Establishment (ALE) and fixed-frequency MAC protocols. These are also described in the book of Johnson et al. [111]. In [112] we find measurements on a MIL-STD-188-110C [113] link over distances of up to 160 km, providing the users with bit rates up to 9.6 kbps in 6–9 kHz RF bandwidth. The standard gives the option of selecting bandwidth and modulation, and includes wideband modulation with up to 24 kHz bandwidth with elaborate coding and interleaving.
So, some military radios use a narrow slice of 6…9 KHz for each channel and push 9 kilobits per second. Widening the slice used will give more speed. Enough to send SMS, I would say. A text of 1000 characters could be 8 kilobits, and would require initial air time for 1 second (+ exponential back-off resends, most likely). Let’s assume a total of 3 transmission events per message. An hour contains 3600 seconds, divide by 3 --> a channel at 100% capacity could accommodate 1200 messages per hour.


OP, you have just spammed the same post to 9 communities. The document you posted is from year 2016. I should note that a few things have changed since them. Iran has massacred over 1000 protesters during the Mahsa Amini rebellion. Iran has supported the Russian invasion of Ukraine. Iran has had a war with Israel (but I can’t really blame them, since escalation was mutual). And most recently, Iran has massacred what’s likely several thousand protesters during the past few days.
I should note that Iranian people, all of them, also have plans. The US isn’t the only organization on Earth with ability to plan things, and attempt to fulfill their plans.
Some ayatollahs plan to keep ruling with an iron fist, killing thousands if needed. Some leftists joined them in revolution decades ago, but were surprised to see that the ayatollahs hijacked state. Those leftists used to blow the ayatollahs up (in scores) decades ago, but had to retreat out of the country. Some king used to rule before the revolution, and surprisingly some people think the king’s son might be a suitable person for a transition government. I notice that he seems intelligent, but I don’t think he’s suitable. He’s just their best known opposition figure currently…
…but of course, talk of a transition goverment is pie in the sky fantasy as long as 12.7 mm flies on streets.
The most pressing problem is that protesters have lost over 10 000 people as prisoners (likely to be excuted as “enemies of god”) and likely several thousand as dead, while the Basij and IRGC have lost less than 100 members.
The most pressing problem is that Iranian protesters aren’t armed, don’t have explosives, don’t have decent communications and most of them don’t know how to improvise weapons, explosives and communications. As a result, they’re getting slaughtered.
There is also a secondary problem. A US president promised to protect them, and it seems they believed him. They shouldn’t have. Even if he intends to do something, they’ll be dead by that time.