The first one we saw that I got a picture of was a Sentry 20V2T (or 15V2T) on the side of I65 (I believe):

Sentry 20V2T (or 15V2T) on the Way to Elgin, IL by mrboojay, on Flickr
Next was an ASC RM-130 next to the Boomers water tower near Chicago:

ASC RM-130 Near Chicago, IL by mrboojay, on Flickr
We then passed by a 2nd Gen 2001-SRN. I don't know the name of the town:

2nd Gen. Federal Signal 2001-SRN by mrboojay, on Flickr
Then as we were exiting the interstate we passed a 3rd Gen. 2001-SRN behind a City Building in Elgin (I forgot the name of the building):

3rd Gen. Federal Signal 2001-SRN in Elgin IL by mrboojay, on Flickr

3rd Gen. Federal Signal 2001-SRN in Elgin IL. Front Shot by mrboojay, on Flickr
Then we went to do the IT job, but we were not able to finish it that day, so we stayed in a hotel. On the way to the hotel we passed a P-50 in Bartlett, IL! On the way up we were pretty excited wondering if it was a satellite or not. I pulled out our video camera to zoom in and see if it was one, and it was!

ACA P-50 in Bartlett IL by mrboojay, on Flickr

ACA P-50 in Bartlett IL. by mrboojay, on Flickr

ACA P-50 in Bartlett IL. by mrboojay, on Flickr

ACA P-50 in Bartlett IL. by mrboojay, on Flickr
This one really makes it look big! Also I do not know what the solar panel is for.

ACA P-50 in Bartlett IL. by mrboojay, on Flickr
Then next we stopped at the Federal Signal plant to get pictures of their 2001-130, 508, Eclipse 8 and Modulator MOD 6024:

All 4 sirens at thr Federal Signal Plant by mrboojay, on Flickr

All 4 sirens Close-Up at the Federal Signal Plant by mrboojay, on Flickr

Federal Signal 2001-130 and 508 at the Federal Signal Plant by mrboojay, on Flickr

Eclipse 8 and MOD at Federal Signal Plant by mrboojay, on Flickr
(From here on the picture quality drops, I filled up the xD card in the camera (Olympus E-Volt 500), so I had to use my pocket camera (Olympus FE-47) and the lens had a big smudge on it.)
After we stopped at the plant we drove down the road from it and saw a 2nd Gen. 2001-SRN next to a fire station not too far away from the plant:

Federal Signal 2nd Gen. 2001-SRN by mrboojay, on Flickr
We drove down the road more and saw a small town called Peotone, IL, so we looked to see if we could find a small fire department with an old siren, and we found a 2001 Roundback. It wasn't at a fire derpartment but at the "derpartment of public works"

Federal Signal 2001 Roundback by mrboojay, on Flickr

Federal Signal 2001 Roundback by mrboojay, on Flickr
After that we drove down a long stretch of road and saw another small town called Beecher, IL and looked for fire department there too. We took one road and saw a 3rd (or 4th?) Gen. 2001-SRN:

Federal Signal 3rd Gen. 2001-SRN in Beecher IL by mrboojay, on Flickr
Then we went to another part of the town and saw a 2001-130 (no pictures). Then we saw a Model 5 at what looked like a retired fire department (there was a new one across the street). The whole pole was yellow too:

Federal Signal Model 5 in Beecher IL by mrboojay, on Flickr

Federal Signal Model 5 in Beecher IL. by mrboojay, on Flickr
We drove down the road more and saw a 2001-130 in some town I do not know the name of (if it was a town):

Federal Signal 2001-130 by mrboojay, on Flickr
Then, lastly a Whelen 4000 after driving down the road more to the interstate in Lowell, IN:

Whelen 4000 in Lowelln IN by mrboojay, on Flickr
There are more pictures here:

Enjoy!
The total sirens we saw there were:
1 Federal Signal STL-10
1 Federal Signal 508
1 Federal Signal Eclipse 8
1 Federal Signal 2001 Roundback
1 Fedelcode(?) Model 5
1 ASC RM-130
1 Federal Signal Modulator MOD 6024
2 2nd Gen. Federal Signal 2001-SRNs
4 Federal Signal 2001-130s
5 3rd Gen. Federal Signal 2001-SRNs