does this product eliminatate having to change FM freq. everytime I drive into a different area and will this work on onyx radio

If your radio base has a FM plug in the back it will work. I think if the radio puts out at 98.1 and your radio is tuned to it, you should never have to change it.

Where does the 3.5mm plug go onto the radio dock? Into the FM out or Audio out?

It goes into the Fm out. Thus will not replace the xm antenna either. You will still need to use the antenna provided. This device will only make he xm come over the radio. The audio out would work if you had a aux in on your head unit.

Is this a standard modulator, i.e. can I use it with my phone as well, or does it have some proprietary Sirius stuff that would prevent me from that?

I tried plugging a standard sized (being 3.5 mm) headphone plug into the back of the Sirius XM device I have, and I'm pretty sure that the fm Jack is at a slightly different size then a regular 3.5 mm headphone jack. Plus, your talking about plugging your phone directly into the RF jack of the back of a radio without anything inbetween except this device, I'm pretty positive that you can't hook this directly up to the back of your radio and your phone, and expect it to work on the hardware level. I mean, on my Sirius XM device, it has a setting that you need to go into to select a frequency that it's going to broadcast on for the radio, so, I suspect that it won't work with your phone. So, yes, I'm pretty sure it's proprietary to the Sirius XM device.

Do I need a separate antenna for the sirius radio if I use this?

Like peter mentions, if you want to be able to pick up the Sirius XM satellite with this device, you'll have to use a separate antenna for the Sirius XM dongle.

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SiriusXM FMDA25 Direct Adapter

Product ID: 2740840

Details

Brand
Audiovox
Color
Black
Connectivity Technology
Satellite
Included Components
Computer Cable
Power Source
Corded
Product Dimensions
4.25"L x 2"W x

📡Direct hardwired FM connection

🔄Seamless toggle between Satellite & FM

🔇Static-free, interference-free audio

₹ 3589

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Description

📻 Upgrade your ride’s soundtrack with zero static, zero hassle!

EFFORTLESS SWITCHING - Toggle instantly between satellite radio and your regular FM stations with just a power button tap.
DRIVE WITH CONFIDENCE - Enjoy uninterrupted, premium satellite radio on every journey, no matter where the road takes you.
UNIVERSAL COMPATIBILITY - Works flawlessly with all SiriusXM Dock & Play and Portable radios, plus XM PowerConnect kits.
PLUG PLAY INSTALLATION - Includes all necessary wiring and adapters for most vehicles—no guesswork, just pure sound.
CRYSTAL CLEAR AUDIO ALWAYS - Eliminate static and interference with a direct FM connection behind your dash.

The SiriusXM FMDA25 Direct Adapter delivers a hardwired, static-free audio connection by plugging directly into your vehicle’s FM radio antenna port. Compatible with all SiriusXM Dock & Play and Portable radios, it allows seamless switching between satellite and FM radio with a simple power button press. Designed for most vehicle installations, it includes all necessary components for a clean, interference-free listening experience backed by a one-year warranty.

Specifications

Additional Features	Portable
Asin	B000KGLL84
Audio Output Mode	Stereo
Best Sellers Rank	#48,557 in Electronics (See Top 100 in Electronics) #26 in Car Satellite Radio Equipment
Brand	Audiovox
Built In Media	Computer Cable Adapters
Color	Black
Compatible Devices	Satellite Radio (SIRIUS and XM Dock & Play, Portable Radios, PowerConnect Radios)
Connectivity Technology	Satellite Radio
Customer Reviews	4.5 4.5 out of 5 stars (1,055) 4.5 out of 5 stars
Enclosure Material	Plastic
Frequency	108 MHz
Global Trade Identification Number	00884720004032
Hardware Interface	3.5mm Audio
Item Dimensions L X W X H	4.25"L x 2"W x 6.5"H
Item Type Name	FMDA25
Item Weight	2.4 ounces
Manufacturer	Audiovox - Sirius
Mfr Part Number	FMDA25
Model Number	FMDA25
Number Of Items	1
Power Source	Corded Electric
Radio Bands Supported	FM
Style Name	Compact
Tuner Type	FM
Unit Count	1 Count
Upc	884720004032
Voltage	12 volts
Warranty Description	1 year
Water Resistance Level	Not Water Resistant

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