As a decades-long scanner user, I would highly recommend a dedicated portable scanner over any phone app. I currently have a Uniden base/mobile touch screen digital unit called the Homepatrol II. It is equipped with rechargeable batteries and can work off a USB charger/power supply or an auto USB port. Covers both VHS and UHF bands and mine came optionally preloaded (extra charge) with my local frequency database. Very sophisticated with a variety of menu options and can take any SMA antenna connection or an adaptor for other connectors. Price about $450, and well worth it. Both VHF & UHF frequencies can be monitored with a short "rubber duck" antenna, but I also use a taller retractable metal antenna for the aircraft and railroad VHS bands for improved reception.
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