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You do not unscrew the top of the antenna however you can remove the antenna and use the appropriate adapter to connect another antenna of any type. You want to be careful attaching a piece of wire however as those radios, and all HT's in general, are overloaded fairly easily by strong signals and it's won't take much wire to really enhance the pick up of that radio.
I made a simple "long wire" antenna by soldering a small wire into the appropriate SMA connector. When out in the field, you can just toss it up in a tree, or something like that. For small HTs like this that have general coverage, it really helps.
2022 Aug 08 0839 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 1656 Valid From: 2022 Aug 07 1428 UTC ... Now Valid Until: 2022 Aug 08 1500 UTC ...Warning Condition: Persistence
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
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