Sirius's Echo Home Repeater System, which boosts the quality of Sirius satellite radios by redirecting a signal from an external antenna to units based inside the house, has gone on sale. For $100, you get the transmitter and one receiver module, with extra receiver modules (for extra cash) also available. At the very least, this kit means you don't have to have a bunch of antenna extension cables running all over your house, and at its best it will probably increase the quality of the signal. If you've got multiple radios in your house, then we're sure you'll agree that this is pretty much a must buy: for single Sirius radio owners, notsomuch.