I have looked for scans that you can run on a WEEKLY rather than DAILY basis (like "tell me when a weekly Williams %R closes above -80...") and I find that there is no reliable way to do that... yet...
If anyone has access to a Bloomberg Terminal, this may be a way to do it... but if you have not priced that lately:
...subscriptions to the Bloomberg service... costs between $1,750 and $2,100 per terminal per month
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