Phil,

Cheapest and easiest and effective do not always go together - pick one or two of those properties. Easiest would be a good active antenna, like the one available from Clifton Labs. Cheapest would be a multi-turn loop on a frame - search the web for homebrew designs. - it needs to be rotated, so that may make it a bit more complex, but it can have a narrow field of view which is good for eliminating noise.

73,
Don W3FPR

On 7/18/2015 2:52 PM, Phil Hystad wrote:
What is the cheapest easiest although effective RX antenna for listening to 
whatever below 500 KHz with a K3 and the new K3SYNA board?



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