ATU-20FS Regular Stubby Antenna 450-480 MHz

The Motorola AAM23X503 ATU-20FS UHF Stubby Antenna is a compact antenna designed for compatible Motorola and Vertex Standard portable two-way radios operating within the 450–480 MHz UHF frequency range.

Measuring approximately 3.15 inches (8 cm) in length, the ATU-20FS provides a compact alternative to a full-length whip antenna while offering more antenna length than Motorola's Super Stubby options. Its shorter profile helps reduce snagging on clothing, equipment, and other objects, making it a practical choice for users who carry their radio throughout the workday.

The durable stubby design is well suited for professional portable radio applications where a balance between compact size and everyday radio performance is desired. The AAM23X503 is also an ideal replacement for a lost, damaged, or worn antenna on compatible radios operating within its specified frequency range.

Ideal for security, hospitality, retail, education, maintenance, property management, construction, utilities, and other professional applications, the ATU-20FS provides a convenient and dependable antenna solution for compatible portable radios.

Key Features

• UHF regular stubby portable radio antenna

• 450–480 MHz frequency range

• Approximately 3.15 inches (8 cm) long

• Compact alternative to a full-length whip antenna

• Longer than Motorola's 2-inch Super Stubby antenna options

• Low-profile design helps reduce snagging on clothing and equipment

• Designed for professional and commercial portable radio applications

• Suitable as a replacement for lost, damaged, or worn antennas

• Genuine Motorola Solutions accessory

• Motorola part number: AAM23X503

• Antenna model: ATU-20FS

Compatible Radios

• Motorola / Vertex Standard EVX-S24

Additional dealer documentation lists compatibility with the EVX-261 and EVX-534, but Motorola's EVX-S24 documentation directly confirms the EVX-S24. Always verify your radio model and operating frequency before ordering.

Important

The ATU-20FS is tuned for the 450–480 MHz UHF frequency range. The radio's programmed operating frequencies should fall within this range for proper antenna selection.

This is a regular stubby antenna measuring approximately 3.15 inches, not the shorter 2-inch ATU-21FS Super Stubby antenna.

Specifications

Manufacturer: Motorola Solutions / Vertex Standard
Part Number: AAM23X503
Model: ATU-20FS
Accessory Type: Portable Radio Antenna
Antenna Type: Regular Stubby
Frequency Band: UHF
Frequency Range: 450–480 MHz
Length: Approximately 3.15 in. (8 cm)
Primary Compatible Radio: EVX-S24
Color: Black