As this is the second Tuesday in the month, it should be the 70cm leg of the UKAC activity contest organised by the RSGB. My 2m halo is a good match on 70cm. Although a very poor antenna, I shall be on at 2000z (ish) to work a few stations before my voice shouts "no"! Usually I am on for less than 60 minutes, often much less.
UPDATE 2048z: I stayed on for about 10 minutes only and had 1 contact. Although conditions on 70cm weren't too bad, the level of activity seemed low to me. GB3UHF (432.430MHz) beacon was -9dB here on JT65B on the FT817 with a 2m halo fed with lossy coax, which is quite good. The beacon is in JO01 square.