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Internal vs. External Antenna for 498c

Old 10-09-2006, 09:32 AM
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Default Internal vs. External Antenna for 498c

If I buy this unit, should I get the internal or external antenna? It will be mounted in the E-Box under my T-Top. What if I flush mount it on the dash?
Old 10-09-2006, 10:13 AM
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Default RE: Internal vs. External Antenna for 498c

I have the 498 flush mounted in my center console using the external antenna. Garmin does not recommend flush mounting the internal antenna model. The internal antenna is a stub on the top of the unit and interferes with how the unit is flush mounted (I personally think it could be done if you made a custom spacer plate but I went with the external antenna version, for flexibility of mounting).

I actually mounted my antenna inside the center console up towards the top of the console and have no problems. However, you should try the antenna position first to make sure that the signal gets through. I would think that you could easily recieve signal through your T-Top and "maybe" inside an electronics box mounted below the T-Top.

There has been a lot of discussion on THT about this and I believe if you perform a search on the topic you will probably find answers to many of your questions.

Best of luck.
Old 10-09-2006, 10:39 AM
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Default Re: Internal vs. External Antenna for 498c

I would go external. It comes with the antenna. If you want a seperate, smaller one you can order one for like $26.

If you go internal and have problems you cannot add an antenna to it.
Old 10-09-2006, 11:13 AM
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Default Re: Internal vs. External Antenna for 498c

I have the 498 with the internal ant mounted on my console. Great unit. If I had a top I would have gone with ant. model.


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Old 10-09-2006, 06:03 PM
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Default RE: Internal vs. External Antenna for 498c

ddcrna - 10/9/2006 9:32 AM

If I buy this unit, should I get the internal or external antenna? It will be mounted in the E-Box under my T-Top. What if I flush mount it on the dash?
My installer said that they always recommend an external antenna for a GPS that will be in a box, or under a T-top. I had one (external antenna) installed with my Garmin 498, which I have dash mounted on the swivel mount. With only one WAAS satellite, seems like it could be blocked or at least affected if you had an internal antenna anywhere where there would be some physical barrier. Anyway, it works great with an external antenna and I usually have a position error of 8-10'. Pretty darn good, and usually it matchs almost perfectly on the chartplotter with known points like buoys.

Highly recommend the 498, if you are going with a combo unit. I used to have two units (separate fishfinder and GPS) but I find the combo works fine for me. I usually run with the chartplotter in full map screen mode, with a data line showing digital depth. When I approach an area of interest regarding the underwater fine features, I go to full fishfinder, or the split screen for both, although I don't like that (split screen) mode, much.

EJ
Old 10-10-2006, 10:45 AM
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Default RE: Internal vs. External Antenna for 498c

Go with the external antenna but mount in your console hidden from view. Works very well with little or no loss of signal. Have done this with other units as well. If you have any questions as to how it would work, hook up the antenna and place it outside of the box. Check the signal strength. Then, place it in your box and view the signal strength. The only place that I have ever tried this and it doesn't work as well was when there was cored glass above the antenna. If all else fails, you can always mount the antenna outside and flush to the deck whcih works very well also. Good luck.

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