SparkySKO wrote:
Hello,

I'm running stock power on my radio. I'm using a vertical dipole
mounted in a tree. The bottom of the dipole is about 8 feet (1/4
wavelength) off the ground. The feedline is going down at about a 45
degree angle from the antenna. My SWR is 1.5 which is the best it'll
get.

I'm using a mobile base, with a AC - DC power supply. I receive fine.
Regardless if my noiseblocker is on or not. However, when I transmit,
it sounds god aweful. Others can't understand what I'm saying. I've
used another radio with earphones, and listened to myself talk, and it
sounds like 5 layers of tin foil on my microphone. If i take this same
radio and microphone, and mount it in my truck, it works fine.

I'm thinking the power supply, but don't have a way to verify this yet.
I'm also wondering if there's a chance that this could be because of my
antenna radiating back into my feedline, and creating a feedback loop
or some other type of noise.

My main question is. why is it recommended to run feedline
perpendicular to a dipole?

Your power supply is regulated, right? What kind? Hook an auto battery
to the radio to test it from a clean 12 vold dc supply and see if it
cures your problem, or proves the source of trouble is the power supply.