Preparing to use an Explorer, I'd like to know what after market coil will be most useful in trashy places and if there is a general purpose coil better than the stock coil. So far I'm believing that a 5" round might be the best choice for badly littered spots and there might not be a better general coil than the Minelab stock coil. I've read conflicting reports and opinions about Excelerator, Coiltek and others so I'm also not sure which manufacturers are most dependable and I can't afford to make a bad choice. any and all input will be appreciated -- thanx