Seawatch
thank you. the slides are helpful. several qustions:
- how high is the pedestal for the VHF DF antenna from the sea surface? 
- Are there 2 HF antennas, one backs up the other? 
- DF processing details onboard - I expect that to be DSP-based interferometry rather than the 60's technology of Watson-Watt (Butler matrix). 
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