I'm working on finally getting back on HF again. I had no problem getting my girlfriend's approval to throw up a dipole at her house where we live. The issue I'm running into is getting the coax into the house without or leaving windows open, leaking out heat. We live in Maine, and need to retain all the heat we can.

She doesn't feel as though the typical methods of foam around the window openings and such will be sufficient to keep the heat in, and as it's her house, what she says goes.
Last night a friend send me a link to the
Comet CTC-50M. I've read the two reviews here on eHam, but I'm wondering if anyone has any further experience with it? It's a fair bit of coin to spend on something that a small hole could easily replace. But it addresses her concerns and she would have no problem with me using one, which would let me get back on HF - as long as it works fairly well. I don't have any kind of an amplifier, so its 100w limitation on HF shouldn't be a problem with my Kenwood TS-130S.
Thanks!