A common example is at hilltop beacon and repeater sites.
Antennas at such places need to be super robust and super reliable.
That's not just because of the extreme weather high sites experience.
And commercial users will probably insist on commercial standard equipment and antenna installations.
There don't seem to be a lot of resources online for repeater and beacon antennas. But the one source I found, WA6ILQ repeater builders' antenna information, proved a goldmine. Alternatively you can get some inspiration from commercial manufacturers who make ruggedised antennas for use in or near the amateur bands.
PS: Enjoy the Daily Antenna and my videos? Wish to support them? If so please store this link to Amazon Shopping as a bookmark or favourite. Then when you buy something I receive a small commission (at no extra cost to you). Or browse my books page to see if any titles appeal.