Bad link. But I'm guessing it was supposed to be
this one. That will work with Midland radios and I'm not sure which others. Different brands have different plugs and in Motorola's case, different models have different plugs.
From previous posts, it looks like we will probably be using a GMRS channel. So, any radio that supports GMRS will do just fine. I have a pair of Motorola TalkAbouts with which I am actually not very happy. I still need to test them out some more. I think I may have been trying to use them on an FRS channel instead of GMRS the last time I tried to use them. Needless to say, not being able to hear my guys less than 100 yards away was very frustrating. So, I can't really give you any recommendations on specific radios. But, if someone else does, I might be buying a new radio or set of radios.