I’m going into my OF mode, but that’s OK cus I am an OF! 
When I started on 70cm in 1964 the experts told me time and again, the name of the game is DX, and the secret of success is to get as much horizontal metal as possible as high as possible, high power is nice to have but if you don’t get that metal up high you won’t hear the DX! I started with a 6/6 slot fed yagi and later got a 13-el yagi twice as high, and my AM got me contacts from the Continent. Later the B licencees were allowed on 2m, and I used an 8-el yagi from a better location and after changing to SSB (initially a mighty 10 watts!) was able to take advantage of openings to work all over western EU.
What the current challenge has done is return us to DX mode. Activators still try to get 4+ in the log and qualify the summit, of course, but now they are looking to see how far they can get, and once again we arrive at getting as much metal as possible as high as possible. The high is no problem, of course, the summit takes care of that, the problem becomes the metal. It has to be carried, assembled, and once up it has to stay on target. So far it seems most people avoid the challenge, preference going to low-gain/no-gain verticals for speed and simplicity, and probably they are not hearing possible DX with horizontal polarisation…and here we are on the thresholdd of the DX season with an anticyclone developing in a position that suggests that beaming east might pick up some tropo DX! (only currently my beam won’t turn!
) Of course activity is a pale shadow of what it was even 20 years ago, but I bet that east of us there are still a few die hard OFs tapping their barometers and checking to see if they can hear any beacons from way out west!
If my legs and lungs were still up for the challenge I will tell you what I would be doing. I would be buying a hand held beam, on a summit a mast is not essential. I would be looking at something like the Moonraker YG27-35 with 3 el on 2m (7dBd gain) and 5 el on 70cm (9 dBd gain) to strap on my rucksack, or an HB9CV (cheap and cheerful, only 3 dBd gain, wide as a barn door but a lovely notch on the back to aim at interfering towers!) or even use some brazing rod or copper-plated welding rod to make a 3 el beam on a length of wood - I made a lovely little 4 el for 70cm using brazing rod, a length of wood, a trimmer and a hanful of staples, and it took less than an hour from construction start to first contact! Of course with a handheld beam it only takes a quick twizzle to find the right polarisation.
When all is ready, it then comes down to being in the right place (a summit) at the right time (an opening with other people on!) Its a matter of looking at the met office pressure charts, tapping the barometer, checking the predictions (or casting the bones - about as useful!) and crossing your fingers. There has been some lovely fat anticyclones that never produced a smidgeon of DX, and minor highs that got me out several hundred klicks, there are no guarantees!
One little quirk: my first club back in the sixties went out on a summit during a major opening. They set up the station and switched on, and zilch. Not a whisper of activity. They packed up, went back to the club station and re-assembled the rig, and immediatly worked a stream of Dutch and German stations. They believe that they were actually too high up, above the temperature inversion, and all the fun and games was going on below them. I dunno, perhaps it was an undiscovered fault in the setup, but that was their theory - they were too high. Perhaps its better to be on a one or two point summit during an opening?