myths=rumors=legends=lies.

1. antenna slack in the fuse,as long as you pass a radio check you should be fine.

2. magnets can cause problems with electronic devices,but are you sticking one on your reciever,I don't think so.refer to answer#1.

at least for me, I use fuel that has 10%nitro in my 2st and 4st engines, as long as your fuel has at least 18% oil then you can run it in just about any engine with the exception that certain 4st engines like YS run best on 20% nitro 20%oil min.