It is not obsolete. In combination of these, try lowering your antenna even go sideways, turn on attenuation, then even remove the antenna and insert a paperclip.
The Paper Clip Antenna
You'll find so often repliers in many threads love to just say get an SDS scanner to eliminate simulcast issues. Not everyone can afford $650-$700 let alone if they are available especially the SDS 100.
If you do get a new one only consider Unidens since whistlers are even worse. The pro 106-197's were models that did 'fairly well' in simulcast.
Question to all including Whistler. Is there any resolution to monitoring the 800 Simulcast? The older GRE stuff seems to work fairly well, but all the newer stuff seems to be a fail. Once again yesterday I sold a 1040 to a customer and the only way could get it to receive a signal was adding a...
forums.radioreference.com
Depending on your budget if you get new and another desktop, these you'll find will do much better. Hey if one doesn't work out, send it back.
Look at the 996P2 or 546HP be sure to apply the firmware update(s) from Uniden that further helps simulcast issues besides whats in the box.
Your mileage may vary dependent on your location and the towers.
I've been in macomb a number of times, I have the older 396XT Uniden with me and it decodes digital their well.