Can I connect my portable XM radio to my cars existing XM antenna?

Yes, you can connect your portable XM radio to your car's existing XM antenna, provided the antenna is compatible with your portable device. You'll need to use the appropriate connection adapters or cables if required. However, ensure that your portable XM radio is designed to work with an external antenna, as some models may only function with their built-in antennas. Always check the manufacturer's guidelines for compatibility.