BMW E81 E87 Roof Antenna Base Aerial Control Unit Module 6929720 6925356

BMW E81 E87 Roof Antenna Base Aerial Control Unit Module is an original component from the Car Antennas category, designed for installation on the roof of BMW 1 Series E81 and E87 vehicles. The bayonet design ensures stable mounting of the antenna mast and proper radio signal routing, which translates into clear station reception and correct operation of the factory audio system.

Specifications and technical data

• SKU: 6925356-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6929720
• Substitutable numbers: 65206929720, 6929720, 6925356
• Part type: Shark Fin Antenna
• Category: Antennas

Purpose and technical function

The roof antenna bayonet base is responsible for the rigid connection of the antenna mast to the roof panel and for safely routing the signal cable into the vehicle interior. In BMW E81 and E87 models, this component is perfectly matched to the factory mounting hole, allowing for the preservation of the original mounting geometry and proper roof sealing. Using an original antenna base reduces the risk of interference, signal drops, and leaks that may occur when using universal replacements. This is particularly important in vehicles used year-round, where the antenna is exposed to rain, snow, UV radiation, and vibrations.

Benefits of using an original antenna base

Using this base in a BMW E81/E87 provides a number of practical advantages:

• Factory fit – compatibility with the roof line and the factory mounting hole facilitates installation and avoids bodywork modifications.
• Stable mast mounting – the bayonet design minimizes play and reduces antenna vibration at higher speeds.
• Protection against moisture – a properly selected base helps maintain a seal at the roof penetration point.
• Consistency with the electrical system – maintaining the original connection point promotes stable radio signal quality.

Product characteristics and condition

The offered roof antenna base comes from a BMW vehicle and is a used component, which in practice means it was previously operated in a car but retains functionality suitable for further use. For many users, this is a reasonable compromise between purchase cost and maintaining the vehicle's original specifications. Choosing a used OEM component is particularly attractive for parts such as an antenna base, where structural fit and proper cooperation with the factory installation are key, and operational wear is usually limited.

Selection and practical application

When replacing the roof antenna base in a BMW E81 or E87, it is worth paying attention to compatibility with the body type and the type of bayonet antenna used. A properly selected component allows you to:

• restore proper radio reception after damage to the mechanical part of the antenna,
• eliminate leakage problems in the antenna mounting area,
• maintain the original roof appearance without additional adapters. Thanks to this solution, you can neatly complete a roof repair or audio system upgrade without interfering with the body structure. If you are planning a comprehensive repair or upgrade of the roof area in your BMW and need other components from the same group, such as an antenna mast, mounting gasket, or additional mounting accessories, check out the available parts in the BMW Car Antennas category.

A safe choice for used BMW parts

When deciding to install a used antenna base, it is worth taking a conscious approach to selecting components from the secondary market. If you want to learn which body and electrical components in German cars are worth buying used, and when it is better to opt for new parts, check out the article: Renovation and repair of German cars: which used parts are worth buying and which should you avoid?