I've had an SDS100 for almost exactly 2 years now. In 2023, Uniden had a rare Cyber Monday sale, so I got the SDS100 for either $50 or $100 off MSRP. It's a solid scanner, with a learning curve. I watched a LOT of YouTube videos on this. The Uniden Sentinel software makes it super easy to update the scanner firmware, scanner database (new updates are released every Monday) and make customizations. Even though this scanner is 7 or 8 years old now, it's still being updated, an update just came out a month ago, and Uniden publishes the change log.
https://info.uniden.com/twiki/bin/view/UnidenMan4/SDS100FirmwareUpdate
After a ton of research, I realized it's pretty much not up for debate that the Remtronix REM-820S is the best third party antenna for the scanner and out performs the OEM
Remtronix REM-820S UHF SMA Antenna
I bought this cup holder mount for the scanner and it is solid, even bought a second one for my Midland GXT67 GMRS radio
https://www.amazon.com/dp/B0CHHYWL9Y
The GPS functionality is flawless. I think they used to sell an official bundle, but all you need is this GPS antenna and this cable and then go into the menu and enable it. The GPS puck does not need a clear view of the sky. I have it shoved in a storage compartment that has a sliding cover to keep it hidden that located below my center stack. I do not know the exact range it looks for when in GPS mode, but because of living in Western NY, quite often it's scanning frequencies licensed to agencies in Ontario, Canada if I'm heading north, or agencies in Pennsylvania, if I'm heading south.
https://www.amazon.com/dp/B0BJSJHS4B
https://www.amazon.com/dp/B07JQFHLBL
Be aware, there are licensed upgrades that are available that add to cost of this already expensive scanner. If agencies in your area use DMR, ProVoice or NXDN, you have to buy the keys for each one of these three to be able to listen. DMR is the only one that is in heavy use in my area so I bought that. There is some ProVoice, mainly just an ambulance company and the GM plant, IIRC. Check the maps on Radio Reference for more info for your location and locations you plan to travel to. And of course if agencies in your area are encrypted, you wont be able to listen at all.
Also worth mentioning, using a police scanner in a car is illegal in 5 states, none in your region though, Minnesota, Indiana, Kentucky, Florida and my dump state of New York. I quite frankly don't give a flying F' though and have it on every time I jump in my car. I fail to see the difference between using the Scanner Radio app on Android Auto, which is not illegal, versus using a real scanner.
Of note, you may want to wait. Uniden announced the SDS150 at SEMA, it has built in GPS, Bluetooth, comes with an actual changing dock as has a few other upgrades. Availability and pricing has not been announced yet. This should result in the SDS100 dropping in price if you're still interested in that one. Link to product flyer in second post here
New Uniden Scanner announcement at SEMA 2025
