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Small black plastic antenna adapter cable with two connectors

METRA

METRA 40HD20 Honda-Acura Antenna Adapter 2005 car electronics accessory

SKU CH-MWM4-2DTT2

Antenna adapter cable connects a 2005 Honda factory radio to an aftermarket antenna

  • Product typeInstallation Tools
  • Compatible with 2005 Honda-Acura vehicles
  • Connects factory radio to aftermarket antenna
  • Metra Electronics 40-HD20 model
  • New condition installation accessory

Honda-Acura Antenna Adapter 2005

This Metra adapter connects a factory antenna cable to an aftermarket radio in select 2005 Honda and Acura vehicles. It replaces the original connector without cutting or splicing the harness. Installers use it when upgrading the head unit while keeping the existing antenna feed.

Installation Tool for Radio Upgrades

The adapter plugs between the vehicle antenna lead and the new receiver, preserving signal continuity. It fits the specific factory connector shape used in the listed model year. Builders who need a different connector style or are retaining the original stereo will not use this part.

How it compares

Measured against everything we stock in Car Audio Accessories & Wiring, at today’s prices. Recalculated every night.

Price $5.99
Cheaper than about 95% of the 2,768 comparable items (median $21.99).

Specifications

Product
Product typeInstallation Tools

Questions about this item

Does the 40HD20 adapter maintain signal quality during long drives in a 2005 Honda?

The 40HD20 provides a direct factory-to-aftermarket antenna connection for 2005 Honda models, preserving the original signal path without added electronics that could degrade reception over extended use.

Does the 40HD20 generate heat or draw extra power when the radio runs all day?

The 40HD20 is a passive cable adapter with no active components, so it produces no heat and draws no power beyond the negligible resistance of its conductors during continuous radio operation.

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