Antenna to mount on fender tricks?

[MM in NM]

Right now my 79 has a windshield antenna but it has a crack so I'm going to have to replace it sooner or later. The fenders I'm going to use on the refresh of this truck has a crude cutout. My previous expierence with these fender mounted antennas always comes out that there isn't a lot of room there plus it seems that any aftermarket (universal) antenna just isn't able to remain exactly upright and thus, looks half arse.. I'm either going to have to french a new mount to the fender while I have it off or find an antenna that's made for the job.

Any of you guys have any tricks?