In reply to G7MLO:
This falls into two parts: radio equipment and hill gear. Take the radio equipment that will do what you want to do, that is very much a personal choice but be prepared for a steep learning curve!
Hill gear very much depends on what hills and what time of the year. For the lower hills in summer, 1 or 2 points, you need little more than you would for a nice long ramble in the country, good footwear, a waterproof, a map (and the ability to read it!) and your lunch. For the higher hills you get into a routine when packing your rucsac - map, whistle, compass, torch, extra clothing, shell clothing, emergency rations - and you will need more fluids than you think - and I recommend those gloves with the finger tips missing so that you can operate without having to take gloves off! In winter add a bivvy bag and consider instep crampons if you are prepared to brave snowy conditions but that is just an option. Summer or winter, low hills or high, don’t despise walking poles, they really do make a big difference - and they can be useful for keeping the ends of wire antennas off the ground, they can even be clipped together to make a low mast if it is too windy for a roach pole or the d****d thing breaks! Any text on hill-walking will give you lots of additional information. Incidentally, I always take a part roll of duct tape - if there is a handy fence post, standing stone or trig point you can tape a mast to it and it is more reliable than bungees…but take the used tape home with you! Finally, some closed cell foam matting to sit on.
Don’t neglect to check the weather forecast before you go out!