We were meant to hear Saul mention the phone. Also, even if the phones are encrypted, they can tell that there is some sort of radio chatter. The Dunbars even have a network.

Besides, if they are trying to lure Saul into the Colony....and they have the radio and by your own scenario it doesn't make sense to seek them out in LA....why didn't they just call over the radio?
If the radios are encrypted then they would not have been able to just call them up.

If they are meant to lure and are listening in on police bands, why would Pete bring up the idea of being overheard? That would kinda tip one's hand wouldn't you think?
Glenn assuages any concern about that by saying that they are encrypted. Besides, Pete is clueless. He's doesn't know what's going on at all. I think they all are, but Pete is the most clueless. He has no idea that he's been sent by the Mallers to do their secret bidding. Example: When Saul is trying to convince CJ that Lizzy is still alive he says Pete mentions Lizzy by name. Pete, trying to be as accurately helpful as possible says, "Well, actually I said Libby, but Lizzy sounds about right." Pete believes his own story because he's is telling the truth about what he knows. He didn't even want to let Saul and Victor into the school. Besides, there is no need for the Mallers to clue in Glenn and Pete on what their mission is. In fact, they might not even know that they are on a mission. They think they escaped, fair and square. They were probably allowed to escape like Luke, Han and Leia did from the Death Star. Also, who in their right mind would send Glenn all alone into deep doodoo voodoo zombieland. He sounds old enough to have overheard the Titanic's distress call first hand. Let him escape with a couple of others for his own protection. Pete must have really wanted to get out of there. His back has been beaten more severely than Glenn's arm.

Plus, It makes no sense for Glenn to say, "I wasn't going to say anything but I can fix your Satellite Phone." Why WOULDN'T he say that? If he wants to get the heck out he would have blurted out, "Hey Saul, I can fix that!" Instead, he didn't even hear Saul mention the broken phone because he was gibbering on about Roman turning into a zombie.

We don't know that Glenn missed the Sat Phone. Yes, he was busy talking at the time that Saul found it, but the volume of Saul's voice went up noticeably when he found it and we don't know which way Glenn was looking at the time, he could have seen the phone and realized it was something he could fix. Besides, why would the Sat Phone have been brought into the story, and left for the survivors to find if it's just going to be thrown away with no payoff?
Yes, Glenn could have seen the phone clearly, but it still makes little sense for him to keep to himself his ability to repair the sat phone. If Glenn was thinking to himself, " Ooo, a Sat Phone. I can fix that baby like brand new. Better keep that to myself. I don't trust these guys, yet." Then it wouldn't make sense to say effectively, "I can fix that Sat Phone. I wasn't going to tell you guys that I could do it but then I changed my mind." CJ is already paranoid, that wouldn't help them one bit.