Script to enable an wireless interface

Hi Ive got an wireless link that occasionally drops cause of interference

Can someone help me with an Script to enable an wireless interface if another interface goes down?

Start with knowing how to enable/disable an interface:

/interface ethernet set [/interface wireless find name=INTERFACE] disabled=yes
/interface ethernet set [/interface wireless find name=INTERFACE] disabled=no

If you have interference then the first step it to eliminate or reduce it’s effect on the wireless link, as regards a script to enable another interface i would use a route failover script, which you will have to modify to your requirements.