Does anyone know of a good Average Daily Range (ADR) indicator for Tradestation? Thanks in advance.

With your Tradestation platform, there is one already available as an indicator: "Average Daily Range" (not ADR).
Hope this helps.

I appreciate the quick response. I have the latest TS version and there is an indicator for Average True Range of course but none for Average Daily Range. TradingView has a number of ADR indicators including a great one titled Average Daily Range Zones. This is more what I'm looking for. Thanks.

Depending how you calculate Range, ADR and ATR may or may not be the same thing.

Typically Range is High minus Low and True Range is Max(High, Previous Close) minus Min(Low, Previous Close). Hence if the market gaps up or down that is captured by True Range and not Range.

As you say Tradestation has the "AvgTrueRange" which calculates the Average of the 'True Range' not just the 'Daily Range'. If you look at the function you will see that it's simply

 

Code

AvgTrueRange = Average( TrueRange, Length )

Hence if you really want the Average of the (non-True) Range all you need to do is

 

Code

ADR = Average( Range, Length )

In these cases both TrueRange and Range are themselves Tradestation defined Functions.

The following is the tradestation ADR Indicator.
Hope this work for you.
Best!