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don't know what this is
ads on it say radioshack and diaper

Yep, it's the Radio Shack Off-Road Champ.

It was branded "Radio Shack" and sold in those stores around 1986. It was actually manufactured by Yonezawa, who also used the name "Diapet" on a lot of their toys.

This example has been quite badly painted

Yonezawa made some quite nice little R/C toys back in the 1980s, some that were kind of hobby-grade as well.

cheers,
H.

it's not painted at all, its only papery stickers that have deteriorated,
this one has prportional steering and throttle, tires and rims have big cracks, diff is worn out, i don't think the electrics work, tried them nly glitched will try with fressher batteries when i can be bothered