80 yards with the antenna down is incredible....
I can only go about 1/3 of that distance with all these Avistar/Superstar Selects with the Futaba Skysport...They start twitching after 30 steps away...
I've flown my airplane with the antenna down (Airtronics) and never had a glitch, so I'm thinking there is something going on with all those Futaba's!!
You're good!!
It's not that hard to tell if your antenna broke...It's VERY hard to get a clean cut unless you use a wire cutter. If you broke it or ripped it, the end will be stripped, messed up, or just noticably different.
The original antenna's tip is a very clean smooth cut...