I’ve seen the question these collars effectiveness in the brush. This picture is of collars being used by a nearby ranch, and their country is thick and steep. I haven’t had a chance to ask them how they are making out with them yet though. I just found the pic on Facebook.
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@Silver , those are the eShepherd brand from Gallagher. I personally think they've got the best developed system, have had the most money to work with in development, one of the first out there so more time to work out the kinks (they and NoFence started out about the same time). They (eShepherd/Gallagher) started out as "Agersens", and then got bought out by Gallagher... which says something too. Gallagher doesn't mess with the junk, looks to be quality product. The pic in
@klm3030's post looks to be the Vence collar (they're currently undergoing some hardware changes to improve performance, which has been an issue for them in the past). And
@Silver's post above from 11-3-25 looks to be the Halter brand.
I don't think that "brush", per se, will be the main concern for maintaining a good connection with the collars... it'll more likely come from remote/rough terrain conditions (same way that you lose cell/GPS signal continuity in those conditions).
See the concerns I posted on the "screwworm confirmed" page recently too (
https://www.cattletoday.com/threads/screw-worm-confirmed.136335/page-7)... not a silver bullet, for sure. But they definitely have their place, and offer some benefits. I don't think that cost is one of them though... Probably best suited for areas where you have to put in alot of fence per cow in tough terrain (steep, rocky, etc.) if wanting to subdivide pastures. Unless you're in open range country, you'll still need physical perimeter fencing, at a minimum.
My guess would be that the "herd" mentioned by
@Dave originally is likely in open range country, and being that this post originated over a year and a half ago, they probably are a "prototype herd", meaning they probably got some kind of deal from the collar companies to be testing the systems on a large scale... along with some potential grants to help with the cost. All of this is honestly "essential" to getting to full reliability of these systems... we, as producers, don't want to be footing the bill entirely for these companies to be experimenting on OUR herds, but we DO want these products to be proven in real world conditions.
Remember that once you buy them, they're "tech" that is changing rapidly, and they're YOURS (what's your cell phone worth as a used unit?). And the subscription fee to be using it NEVER goes away, AND DOESN'T HAVE AN IRON CLAD LIMIT ON WHAT IT WILL BE IN THE FUTURE (kind of like time share maintenance fees). Very likely, within a few years, the technology will have changed enough that the "old collars" will have become obsolete, and no longer supported by the service (think Windows 10 right now). And of course, THAT means that you no longer have a fence at all, and you need to start over. A physical fence, once installed, is yours forever, without any subscription fee to be functional. And it's 100% repairable by YOU... With a physical fence, if you do it right the first time, it'll still be standing and functional when your grandkids are running the place.