Cable to split power and data

[ear]

I have an older pi that cant power my wifi antennna. I have a power bank that can provide 1 amp from both its usb outputs simultaneously. What cable do I need to power the antenna from the power banks other usb slot (the first one will power the pi itself)?

[gregeric]

If it's a Rev 1 Pi (no mounting holes) a neater solution may be to replace one of the USB 140mA polyfuses with a wire link, as effectively they did for the Rev 2.