Just wanted to update on this, as I have been using the antennas for a couple months now.

I put them on and did some side by side comparison and saw a good difference in disntance between the stock antennas and the tuff antennas.

I have been having a problem with a couple of collars recently and ...

If you are refering to when I first load the dogs up to go hunting, I always do that...

I turn all the collars on...get a good lock to make sure they are all working good..then go and load up and put the collars on the dogs as I load them in the box.

Everything works fine until the next morning ...

Does anyone know how to revert back to a previous version of frimware on a DC40??

A little update on this question....

I changed back to the original antennas on the two that dont work. I was able to figure out it wasnt the antennas.

What I am seeing is that the two with the problems communicate fine with the 320...comm signal is strong...it is that they are loosing the gps ...

wondering if any of you guys have had this problem and might have some things to try to fix it.

I have 6 DC 40 collars....two of them are giving me problems.

When I take the hounds to a training pen and drop them off, I have reception on all 6 collars. I can even track all 6 up to two or three ...

My first post and Im glad I found this forum...Im sure I will have more questions.

I am finally taking the dive into some GPS...got a buddy getting the new Alpha system and Im going to get his 320 and DC40 collars.....

All of the DC40's Im going to get still have the stock antennas on them. I did ...