I have now read the book Black Autumn as well as viewed the movie Homestead and watched the first two episodes of "Homestead: The Series" which is a continuation of the movie Homestead with the same characters/actors. The storyline is slightly different in the movie than in the book. While I found the book entertaining, I also was frustrated with the lack of research done by the authors regarding basic radio theory and usage as has already been discussed. I agree that just letting everyone in is a bad plan. If that situation was real, then there would be a constant flow of people to the Homestead gate. Once they let the first group of "everyone" in, it would be much harder to keep others out as the crowd of refugees continues to grow outside the gate.
I don't understand how a dedicated wealthy prepper who has the wherewithal to purchase the large property, all the stuff that might be needed on a homestead, including food, animals, weapons, and ammo, and can put together a MAG and security team as it appears was done, did not plan better for the interpersonal issues that are bound to happen in any group under stress. Not planning for what might develop in a WORL situation is foolish.
I did note that the book seems to focus on the protagonist and hardly addresses the rest of the MAG. In real life, those people would be more involved and have much more to say about how things are run, and would probably offer alternate solutions. This was alluded to in the series but never developed.
While I did enjoy reading the book as well as watching the movie & series, there are several issues in each that a knowledgeable prepper would have planned for that the book/movie ignores. Ah well, it was obviously written for entertainment, not for educational purposes.