Don,
As long as your not mounting it in a box the internal will work. I have an HDS10M mounted in an aluminum E-box and it will not pull a signal. I have an HDS10 mounted on the console and it pulls a signal fine. I had to hook the 2 up via NEMA2000 to get the signal to the upper unit.
If you are mounting on the console no problem, even if you plan to flush mount in the console you may need the LGC4000.
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