Dave, I understand remote receiver sites. Some require a Law Enforcement Officer to escort you to the remote site. Seems some sites are truly remote.
My site is not. But I have been to many sites in 39 years, just did not realize a Liveatc feed would originate in such a site. Just what internet feed is available at sites you do not control?
Best guess here: Ham Radio.
Sorry, but I deal only with Public Safety Motorola systems, not amateur radio.