FWIW, I had a tower climber do this on accident. The signal was was considerably lower than expected, but the link did work.
Electrically speaking, the antenna will work (it puts the appropriate load on the transmitter), but you will never get the performance you would otherwise expect to get, as it's not tuned for that frequency.
If you do that this blow up your radio card.
SWR (standing wave ratio) is to high and that can blow up your radio card
And you have not the full performance from the antenna.
The antenna is built according to the frequency properties.Otherwise it does not work well