Until you can pickup Site 2 (VA Center), which I am pciking up with the same setting as you, you will be missing half the traffic.
The ICOM Discone antenna I had needed a moderatly strong signal, cables do go bad especially if out doors and radio frontends can get weaker over time for various reasons.
Tuesday several PBPD mobile units asked for Radio Checks, a few hours later Radio Service was testing the system. I do not know if it had any thing to do with the VA signal strentgh problem.
Also, Tusday night during the rain i noticed that Site 2 was only 2 bars of signal strength. The RSSI showed it was 24db weaker than Site 1, which means way over 100X weaker. I was still able to read everything clearly but I am in town.
I am going to get my BC 436HP & SDS100 portables to see if they can even pick up VA Site 2.