Antenna Reception and Stock Amp Options

[XxDarkLightning]

Hello there, I have a question about my antenna reception. I've had a Pioneer P2900MP for a while now that was connected as to use an external amp outside the deck. In this case, it was using the stock toyota amp. I decided I wanted to use the amp inside the deck instead as to not potentially harm the stock amp in future use. So I had to make my own harness that went from the output of the deck and connect to the cable that was connected to the output of the amp as to bypass the amp completely. After doing so my reception has been worse than it used to be. Stations come in and out sometimes that use to come in clear all the time. My question is does anyone know if the Antenna signal was amplified in the stock amp? Since I bypassed it maybe there is no boost? Or can anyone think of interference issues. In an attempt to fix the issue I decided to by a connector that could also use the window antenna as well. Seemed to help a little bit but not much at all. Thanks for the help!