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Small black rectangular antenna adapter with male and female connectors, about fifteen inches long

METRA

METRA 40-NI21 Antenna Adapter for Nissan Radio

SKU CH-6HY7-ZWK5K

Connects an aftermarket radio to the factory antenna cable in select Nissan vehicles

  • TypeCar Stereo Add-Ons
  • FeaturesUsed To Adapt Factory Antenna Cable Connection To That Of An
  • Height0.88"
  • Width2.00"
  • Length15.00"
  • Weight0.06 lbs
  • Adapts factory antenna to aftermarket radio for clean install
  • Compact 15.00" length fits tight dash spaces
  • Lightweight 0.06 lbs adds no strain to harness
  • Black finish matches OEM interior trim
  • Simple plug-in design requires no cutting or splicing

Vehicle Compatibility

This Metra adapter connects a factory Nissan antenna cable to an aftermarket radio. It suits installers replacing the original head unit while retaining the existing antenna feed. Buyers who need an adapter for a different vehicle make or a factory-amplified antenna system cannot use this part.

Installation Notes

The compact black housing measures 0.88 inches high by 2.00 inches wide and weighs 0.06 lbs, so it tucks behind the dash without crowding. A straight plug-in mating is all that is required; no tools or wiring modifications are involved. The only common issue is a loose connection if the factory connector pins are bent or corroded.

Signal Limitations

The adapter passes the RF signal through a passive coaxial junction, so it adds no amplification or filtering. Cable length is 15.00 inches, which limits placement to the immediate dash area. Installers needing a longer reach or a powered antenna lead must source a separate extension or interface.

Highlights

  • Adapts factory antenna to aftermarket radio for clean install
  • Compact 15.00" length fits tight dash spaces
  • Lightweight 0.06 lbs adds no strain to harness
  • Black finish matches OEM interior trim
  • Simple plug-in design requires no cutting or splicing

Specifications

BrandMetra
TypeCar Stereo Add-Ons
FeaturesUsed To Adapt Factory Antenna Cable Connection
To That Of An Aftermarket Radio
Height0.88"
Width2.00"
Length15.00"
Weight0.06 lbs
ColorBlack

Questions about this item

How can I verify the 40-NI21 adapter is working after connecting it between the factory antenna cable and the aftermarket radio?

Turn on the radio and scan for stations; clear reception on both AM and FM bands confirms the antenna signal is passing through the adapter correctly.

What comes in the box with the Metra 40-NI21 and is any extra hardware needed for installation?

The package contains the black antenna adapter only; no additional cables or tools are required to connect it between the factory antenna lead and the aftermarket radio.

Which version of the Metra antenna adapter should I choose for my Nissan vehicle?

Select the 40-NI21 model; it is the specific adapter designed to connect a factory Nissan antenna cable to an aftermarket radio.

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