[Hallicrafters] 40 m antenna used on 80 m - what to expect?

[Waldo Magnuson]

I have a 40 m dipole horizontal antenna and would like to try 
transmitting (HT-44) on 80 m.  What should I expect?  I have a Ten-Tec 
229 antenna tuner and may be able to match - suggestions (helpful) 
would be appreciated.  Thanks.
73,  Skip  W7WGM