There are quite a few ATIS in MARLANT and other units around CFB Halifax, and then there is the whole WTIS over at 12 Wing.
You are NET (C)? There is a mix of NET (C), ATIS and LCIS working at NRS Rx site supporting Mill Cove and some of the folks in S-89. You could get ahold of some of them and pop over for a chat. I know the LS NET (C), he might be able to bridge the gap between ATIS and NET (C) better as he is the Snr Tech there.
As far as the ATIS trade goes, the trg up to the Journeymen level has changed. 226s used to take POET, QL3, and then do a QL5 OJT package which gave them their spec pay/Cpls. Now, its POET, QL3 crse, a QL3 OJT package that can take up to 2 years (not likely in your case...), then they get loaded on the new 5's course, which qual's them Journeymen (spec and Cpl pay).
From having talked about the trg differences between NET and ATIS with that guy I know, I am sure you would fair well on your PLAR for ATIS, as its military to military PLAR, you have a course report that covers the POs you did, etc etc etc. ATIS is looking for people, last count I did, the trade was short 77 techs but that was before the new FY and new SIP. I know the trade is listed in the recruiting bonus list in the CANFORGEN that was released last summer.
Some ATIS are with deploying units (8 ACCS, Trenton - CFJSR, Kingston are examples). Some are with static units and don't deploy, others are with static units and do deploy. I know one ATIS who just left for Maple Guardian...some of the trade (who are non-army backgrounds) are not happy with getting issued tacvests, helmets and being sent to Wainwright. Ruck up. ATIS can be posted at non-blue units, blue unit on army bases (TacHel Sqn's all have atleast 1 x Cpl tech), etc. As far as posting, you can do MARLANT/MARPAC, all the Wings, NCR, you name it. They do deploy to CM and KAF as well, I am not sure if any have been outside the wire so I can't comment on that.
I know some ATIS who have been posted every 3-4 years and others that have been in the same geographic location for 15 years. Depends on the CM shop, and the current CM isn't posting-nuts like the last one was apparantly.
I have only been in the trade > 2 years, coming from the army, so I can't speak too much in depth as I've only seen one Wing and 1 posting as ATIS, but if you want, I can give you some names and numbers to call. I could help you get a 'tour' of WTIS here at 12 Wing too, you could see the different sections that the techs work in (LSS, IT, FM rad maint, AGA, Airfield-NavAids, COMSEC, etc).
If you're interested, fire me a PM, I'd rather not post names and numbers here.