A little piece of advice to those who might even remotely feel that they lost some reception on their radios since switching out their stock HU for a Scion or even an aftermarket.
My wife and I both noticed we would lose signal quite easily so i ordered the Y-adapter + the adapter for the small antenna socket off of Amazon.com (was very inexpensive and came quickly) and installed it yesterday. This was coupled with my having to replace the Ipod cable that I bought off of ebay that had internal-fraying issues, so we'd have to hold the cable + ipod a certain way in order to hear it through all the speakers. If we didnt do this, we would only hear them in the front and it sounded horrid.
I disassembled the dash as per the instructions that were given to me through the forum and i secured the Y-adapter to the existing harness w/ some electrical tape:
The new adapter coupled with the small-to-large adapter, all taped up:
I fished the Ipod cable through to the ash tray (made a small cut in the lower-back corner of the tray):
A closer look at the placement of the cut. (Important to note that there is NO CHANCE that the cable will "fall back" into that compartment. There is some pressing-force down on the cable underneath the ashtray area so that it wont fall back into the compartment.
After everything is back together, I read the T1808's instructions for the "opening screen" and programmed it to read, "Jess's 4Runner". The wife likes it. Mission accomplished.