RTL-SDR is a TV tuner, not a sound card. You could build a radio that transmits on FRS frequencies, but it would be illegal unless you submitted a radio to the

RTL-SDR is a TV tuner, not a sound card. You could build a radio that transmits on FRS frequencies, but it would be illegal unless you submitted a radio to the FCC and received type approval. FRS radios must be type approved, limited power, and with non-removable antennas. I think GMRS radios must also be type approved, but they can have removable antennas. You need a GMRS license to operate one legally. FRS does not require a license. "...breaking in on the Chik Fil A drive-thru attendant..." Seriously? Come on. Other than those nits, you do have a lot of good information in your comment, so thank you for that!