Ok, in that case:
The mast is 610m agl, or 610m msl, or 2000' msl. To clear it by 1000', we need to be at 3000'.
Since we have QNH correctly set, if it were an ISA day, the indicated altitude would be 3000'.
But it's not an ISA day. The temperature at 3000' on an ISA day would be 11 degrees C. The temperature we're given is 14 degrees F, or -10 degrees C - 21 degrees below ISA.
Because it's cold, we will be lower than indicated. The approximate correction is 4% of your height above ground for every 10 degrees below ISA. So for 21 degrees below ISA, we need to correct by 8.4% of our height above ground. Height above ground is 3000', so the altimeter will indicate 3252'.
FFF
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