Harrier is a great plane. Use low rates at first! I always use low rates to take off and land. It could be because I'm not really used to the plane yet, but on high rates, a touch of elevator on landing will rocket it back into the sky.

I did what you are asking with my antenna. I just drilled a 1/16 hold about an inch behind the canopy and ran it out there.

This plane on low rates is 10x easier to fly than my trainer. Honestly. It tracks straight as an arrow and floats so well I have trouble getting it to land. I am using a Saito 100 and an APC 16x4w prop, and it still doesn't slow it enough even if I am at dead idle during the landing routine. I ended up having to nose up the plane kind of far out so that it was practically stalled and then use throttle to control the descent.

It will land on a dime. By far my favorite plane. Granted I only own 4.