How do I switch it to Amateur frequencies?

This is a GMRS only radio. It will not change to the amateur frequencies. There are other radios from QYT as well as B-tech that will allow access to amateur bands as well as GMRS frequencies. However this radios at not FCC approved for use on FRS and GMRS frequencies

speaker output- is the audio output a normal jack or something special? a 1/4" jack?

Believe or is a normal audio out Jack

Which Antenna does it use?

A Dual Band Antenna Patriot or Cushcraft. Some of the GMRS channels have been blocked in this model.

what would i buy to plug this in to an AC adapter at home instead of vehicle?

Will need to buy a power converter. 12 volt DC to 110/120 volt aC

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📻 Stay connected, stay protected—wherever the road takes you.

DUAL BAND VERSATILITY - Operate seamlessly on both VHF (136-174MHz) and UHF (400-480MHz) frequencies for maximum coverage.
ADVANCED PRIVACY CODES - Keep your conversations secure and interference-free with customizable privacy channels.
COMPACT VEHICLE READY - Designed for on-the-go pros—perfect for farms, trucks, and off-road adventures.
POWERFUL 25 WATT TRANSMISSION - Cut through the noise with crystal-clear communication up to several miles.
REAL TIME NOAA WEATHER ALERTS - Stay ahead of storms with automatic weather scanning and instant alerts.

The QYT KT-8900 is a rugged, FCC-licensed 25-watt GMRS mobile radio featuring 15 GMRS channels and 8 repeater channels. It supports dual-band VHF/UHF frequencies, integrates NOAA weather scanning with alerts, and offers advanced privacy codes to ensure secure, long-range communication ideal for professional and recreational use in vehicles, farms, and outdoor environments.

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