NYDutch knows this well. But for the young 'uns, the old TV antenna signal lead was called "twinlead" and it was unshielded. I can't tell you how many times I saw ignorant people STAPLE across those two leads! The signal spreads out from the two conductors, so a staple across the twinlead will short out the RF. And you also don't want to run it right next to an conducting material, such as a gutter, or that shorts it out too. That is the "why" for these standoffs.