Older Pentair Wireless Remote / Newer Pentair Screen Logic

When we had our pool built we had the Pentair Intellitouch Screen Logic system installed. And it works great with our phones and computers. But of course my wife wants a remote she can use at the spa instead of her phone. In case one of the kids splash or drops the phone in the water. So we looked into the older wireless remote system. I found a remote on eBay but then after more research realized its a completely seperate system.

So here is my question.

On the Easy Touch Main unit the Intellitouch Antenna that communicates with the lan box with 4 wires. It is specfic that antenna with that box.

The older system kind of works the same way requiring a specifc antenna.

Can I hooked up two antennas to the same port. When we are using our devices the older system will work and when we are not using the older system, then the newer system will work ??

I do not have the antenna for the older system yet.

Has anyone tried this ?