Upgrading the stock rubber duck antenna on a portable scanner is a simple way to improve its performance. While the stock antenna works decently across different bands, it’s not exceptional on any of them. That’s why it’s worth considering an antenna upgrade. When searching for a replacement, make sure to find one with the right connector for your scanner.
Most scanners have a BNC connector, which is a twist and lock-style adapter. Many of the high-end Uniden handheld scanners over the last two decades have had an SMA connector, which is a threaded connection. For years, most of the replacement antennae come with a BNC connector. Uniden includes a BNC to SMA adapter. But we are starting to see more options available with the SMA connector.
I often get asked, “Should I choose the SMA to BNC version of that antenna upgrade?” I ask if you plan to share the antenna with other scanners that have a BNC connector. If yes, go for the BNC version for easy sharing, as long as you have the SMA to BNC adapter that came with your Uniden scanner. Uniden’s BNC to SMA adapter is sturdy with a weighted base, unlike some third-party adapters. If not sharing, go for the SMA version for a direct connection to the scanner to avoid signal loss from using an antenna adapter.
Consider using antennas with a BNC connector on your scanner instead of constantly switching between antennas with an SMA connector. Leaving the SMA and BNC adapter on your scanner can help protect the SMA connector from wear and tear.
Uniden SDS100 owners, beware that you need to be cautious as some SMA antennas may not work with the SDS due to its waterproof collar around the connector. If the SMA connector has a thicker base, it will not fit. Many antenna manufacturers have either changed the design or offered SMA SDS100-friendly versions of the antenna.
