I'm not familiar enough with the show to identify Rick by seasons.
I can spot a first season because he has the hat instead of Carl. After that he cycles between clean and dirty.
I did find this. Pretty sure it's a later-season Rick.
View attachment 620006
And here's the back of an MTX838.
View attachment 620012
I think it's the same walkie-talkie. But the later-season radio antennae seems to have lost the ball-end antenna and had it replaced with a capped antenna. Like this.
View attachment 620011
And this antenna is the same manufacturer of the ball-end one. So they may have used this exact model for replacement.
This antenna is a Motorola NAE6483
I think if you bought the Walkie Talkie with the ball-end Antenna and this cap-end antenna. You can have a early-season and late-season Rick Radio.