shrink tubing, solder, molded unions?)? . . . wherever 2 or more wires are joined into one inside the black corrugated wire loom found throughout the engine wiring harness.
. . . or is there no problems arising with signal noise from doing this, if the only signals present in that FCC-assigned frequency range happen to be the "pure" digital TV signals themselves?
without damaging the paint under? . . . the decals, such as pin stripping, etc. Factory-applied decals tend to be much better adhered than simple stickers.