1999 silverado: recently have poor reception on the radio. Antenna is good with no kinks in the cable.

One way or another, you have a poor connection from the radio to the antenna. Check the following and make sure all cables are clean and completely and properly inserted:
- a poor antenna cable connection to the adapter or from the adapter to the radio
- a faulty adapter
- a damaged antenna cable connector (wire in center pin)
- a damaged socket on the radio

check your antenna wire to see if it came unplugged from back of radio

for the poor reception have you plugged in the antenna wire into the radio

There is no Am anymore only FM, you may pick up bit but nothing good!!

Have you or someone pulled out the radio in your vehicle recently it could possibly be the antenna plug isn't pushed back in all the way?

It may be more of a design flaw oppose to a actual problem. However, you can purchase signal booster that simply plug between the radio and the cars antenna.

the radio could be bad as well. if the tuner in the radio is bad it wont get reception either. go with a good aftermarket one not a cheapy there no good anyway.

the usual cause of this is a defective antenna or antenna ground, if it is a power antenna verify a good ground, if ok replace the antenna, also check the coax connector to the back of the radio.

Check antenna connections at radio and antenna assy.. Poor connections will only receive AM and hardly any FM

If the antenna is on the front, pop the hood, and locate where the antenna wire connects to the bottom of the antenna and make sure it is connected well. If everything checks out there, you will have to pull the radio from the dash, and look at the back of it. There will be a large black wire by itself connected to the radio. Push it in to make sure its connected as well. That could really be your only problem unless your radio happens to have a fault on the inside which is extremely rare. Hope that helps