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Grid Dish and Helix Feed

1.  Has anyone replaced the linear dipole feed for a helix feed on the 26T2400 Conifer/Andrews bbq dish antenna? This grid antenna was once offered by R Myers.  It's a 2.4 Ghz 22dB grid dish antenna, 2x3 feet.  

2.  This is not an oval dish and does not use an offset feed.  It's rectangular with a radius curve top and bottom.  Will W1GHZ's HDL_ANT program work for finding focal point? 

3.  Do helix feeds work on rectangular dishes?

Thanks, ron n6paa

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