Dc 30 after market antennas

I have 4 dc30 collars that I run mostly on my beagles but I do run them on big dogs sometimes when I go out with other people.2 of the collars are four years old and still have stock antennas on them and I am looking to update them .what ones work the best and where can I get them .does anybody run the long after market antennas on their beagles and does on cause any problems?
Thanks for any info.

I have long range aftermarket ones on all my collars and never had a problem....Couldn't tell ya what works best,but think they all help.....I even run a few made by a fella here in Maine that work as good as the others I've purchased.....The extra length is key, so I tuck them thru the buckle loop to keep them pointing upwards when on the dog.....

Hey bill who in Maine is making them ?

Not sure of his name exactly but will find out....Kurt Rogers had them made for him and he gave me 4-5 of them....Dog Chaser also knows him well.....