First time I put it on the collar, the dog came back with the end (the black protector) missing, and as soon as I grabbed the antenna, its end shattered..... I won't give another 5 euros

It really makes a difference (I don't know how big this difference is). In a collar that I lost first, I changed the antenna and put the Supra. The result was that I lost the collar that was previously the strongest and this one (with the Supra) has a stable connection.