Monthly macd

#1
hi
I'm from Italy
No experience at all about Amibroker , used to be a "Metastock user" now I'm " converted " to Prorealtime
my question is: on prorealtime I have no chance to "scan" stocks on monthly base (weekly or daily)
I would like to build up a very simple "scan":
MACD (12.26.9) > macd(12.26.9) last month
the only condition is: MACD<0
Could someone help me ?
THANKS !