G3X Antenna Advice

[Lyndon]

After researching and talking to suppliers I'm still not convinced what to order 

Any advice???

My number one pick is the GA35 at this point. There is also a cheaper option that sits on top of the instrument panel. Someone who has been down this road, your advice would be a great help. It's not IFR, has a G5 and a GtX45r and of course the G3.

Thanks Lyndon 

[BurnieM]

The GA35 is designed for external mounting but dash mount antennas seem to work fine too.

 

I believe you need 3 GPS antennas;

G3X Touch

G5 and

GTX45R.

 

[Lyndon]

I have the transponder for the GTX. That was simple.

The G5 has nothing?

Just confused with what to buy for the G3X. 

Lyndon 

[BurnieM]

The GA35 is a good antenna and a little more robust than the dash mounts.

 

Maybe you can get away without a G5 antenna.

Comments from Vans forum;

https://vansairforce.net/threads/garmin-g5-external-gps-antenna-needed.160538/

 

I'm a little confused on the GTX as the GTX45R is a transponder.

Do you have the model with the internal GPS or are you using a GPS20A (seperate GPS receiver).

Does this come with an a GPS antenna in the box ?

Last time I looked you needed to purchase a GPS antenna and an ADS-B antenna separately (but this was a while ago).

 

Edited November 27, 2025 by BurnieM

[Lyndon]

I think the GTX has it all inbuilt.

Only one connection for an XPDR anttena 

Lyndon 

[BurnieM]

9 minutes ago, Lyndon said:

I think the GTX has it all inbuilt.

Only one connection for an XPDR anttena 

Lyndon 

If you have only a single antenna mount (for ADS-B) on the GTX then it sounds like you do not have an internal GPS.

 

You need a GPS source for ABS-B otherwise the GTX45R will only work as a mode S transponder.

An IFR navigator (like a GTN650Xi) or a GTX internal GPS or a standalone GPS (like a GPS20A) is needed with the GTX45R for ADS-B.

 

The internal GPS on the G3X Touch cannot be used as an approved GPS source with a ADS-B transponder.

 

Edited November 27, 2025 by BurnieM

[Lyndon]

It has a built in wass and GPS apparently 

Lyndon 

[BurnieM]

There are two models of GTX45R.

 

If it has an internal GPS it should have 2 antenna sockets on the rear and it needs both a ADS-B antenna and a GPS antenna.