Like most, I started out with one scanner.
Then there were times I wanted to do some searching around the Fed. frequencies. (FBI, DEA, USMS, and SS pre-encryption days)
I didn't like the idea of having my only scanner tied up searching frequencies that were rarely active.
But when they were active the listening was great.
At the same time, I would be missing all of the local activity.
So, I got a second scanner. That way I could listen to my favorite frequencies and search others at the same time..
Then I started logging audio and I needed yet another scanner.
Then, more and more stuff started showing up on the air.
So I got a third scanner. etc. etc. etc.
Now I have more than 40 Uniden BCD396*, BCD996*, and BCT15* scanners running 24x7.
And another 30 or so older GRE scanners (mostly PRO-2006 and PRO-2042 scanners on the shelf).
I designate scanners to SatCom, MilAir, Civilian Air, State Police, Tac frequencies, individual counties, power company, etc.
Normally they aren't all talking at the same time. So this listening doesn't 'normally' get too hectic.
For each town or county I normally listen to their PD, Fire, and Tac Frequencies.
I have one for each county's Sheriff, and one for each county's Fire.
Rich
By the way, here's a YouTube video of a LOT of Uniden scanners getting a Close Call hit at the same time.
Uniden Close Call - CC DND - YouTube