ORIGINAL: pattoncommander
Gregg, that's the infantry radio antenna. Main antenna was behind the TC with the MB-50 mast base. The inf radio used a shorter 4 ft antenna with either the mast base MB-50 (came with tank) or rubber whip mount on later models. In some models, mainly the unit XO had a third antenna for aircraft radio. This was mounted in front of the loader near his periscope. Same as infantry radio ant.
Camo, Pershings generally stayed plain OD. They weren't in the war that long and many never saw any action at all.
Swathy and Yellowshaker have posted some nice sources.
just have to find a pic of what it looks like cause just having a hole there looks like it's not finished
i did take all ammo boxes off the side going to make footman loops to tie camo nets and tarps on