When 50' is too much, try out Our 20' extension cable for Sirius XM receivers. This high-quality extension cable has straight-end sib connectors. Works with all XM and Sirius radios in the home and car, boom boxes, plus some OEM automobile tuners. length: 20 foot. Up to 2 extension cables can be daisy-chained together giving you up to 40 additional feet of antenna cable.