external antenna

Hello, I'm in need of some Motorola expertise.... Reading through some forums, people swear that mx to bnc adapters for Motorola ht's work. I have a couple of the Waris and Mototrbo lines. Ht750/1250's and xpr 3300/6350. Looking at the antenna jacks on these radios, I feel that a bnc adapter...

I hooked one up a Palomar Loop Antenna (that works great with my CC Radio) but it doesn’t work on my Superadio. It looks like the Superadio external AM antenna connection is tied to a coil at the end of the ferrite rod with very low resistance. Do I need to use a long wire antenna with the...