Hey Foxy, you know what Dogs like.. :) I still have Radio Vixen's card from the old FRN site when it was posted there.
It's cool how you had such good results from carrier current on shortwave, since some have said it wouldn't work above the AM broadcast band, and even at that it should be used on the lower section, around 500 khz, to be most effective. True, you'll probably get more of the electrical RF field leaking off of the wires at higher frequencies, and maybe less going down the wires using induction, but it will still work at HF to some extent.
There might even be some frequency where the lines in any given area are more naturally resonant and will take power more efficiently than at some other frequency. I haven't tested that so far.
Boomer, The Dog, always floppy, always broadcasting