Based on this product's specifications, here are some alternatives and similar models
CB radio antenna Stabo 60057 — frequency 26–28 MHz, max gain 3 dBi
Summary description:
A CB radio antenna Stabo 60057 designed for use on CB transceivers operating in the 26–28 MHz range. Provides a maximum gain of 3 dBi. Suitable for vehicle or fixed installations where compact CB communication antenna with moderate gain is required. Delivers improved signal reception and transmission within the specified frequency band.