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Old 2 weeks ago
Here for the gear

I've got no direct experiencie because I'm also in the process of building mine, based on other user meassurements going 120 x 60 cm will also work but it may not be as effective. There is a thread somewhere...

Doing a Sandwich: 3cm CIB - Glue - Steel - Glue - 7 cm CIB will also work and make it broadband, but I'm not sure if it will be better on low freq alone.