Bought a livorsi gps speedometer off ebay. Came with the tattle tale switch is all. Need an antenna. Thanks for the help

Beware, some have batteries in them, and some do not. The batteries go dead, and they have to be replaced by Livorsi or resoldered in by someone who knows what they are doing... or update gauge to be compatible with new antennae that does not have a battery. It's probably best to check with Livorsi directly.

If you have a chart plotter with a built in antenna, can it be plugged into that??

If I had a chart plotter it could but I boat on small lakes and don't have one.

Thanks for the advice on the antenna. I didn't think about the battery.

Hopefully you bought a recent model speedo. The new antennas are not compatible with the older gauges.

I did. I made sure of that.